few_shots: 
Example 1:
Concept/skill: 
Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations.

Problem/activity:
You’re mixing ingredients for cookies. The recipe says to combine 6 tablespoons, or ¾ stick, of butter with 1 cup of sugar. You accidentally mix in a whole stick of butter (8 tablespoons) with the cup of sugar. How can you fix this?


Answer: 
Yes. This problem solves a real-world problem involving mixing ingredients for cookies. A student doing this problem would need to reason about equivalent ratios of butter amounts to sugar amounts.

Example 2:
Concept/skill: 
Apply and extend previous understandings of multiplication and division and of fractions to multiply and divide rational numbers.

Problem/activity:
For each pair of numbers, determine if the values are equivalent. Explain your reasoning for each one.
a.
$$-0.25$$
and
$$\frac{1}{-4}$$
b.
$$-\left ( \frac{1}{4} \right )$$
and
$$\frac{-1}{-4}$$
c.
$$\frac{-1}{4}$$
and
$$-\frac{1}{4}$$


Answer: 
Yes. This problem involves understanding fractions and division to divide rational numbers, such as 1, -4, 4, and -1. This problem also involves an understanding of multiplication: if p and q are integers, then -(p/q) = (-p)/q = p/(-q).

Example 3:
Concept/skill: 
Analyze and solve pairs of simultaneous linear equations.

Problem/activity:
Problem 1
The table below contains single equations in a single variable, single equations in two variables, and pairs of simultaneous equations in two variables. Check the appropriate box to show whether there is no solution, exactly 1 solution, or if there is an infinite number of solutions.
|                                                          | **           No solution          ** | **           Exactly 1 solution          ** | **           Infinite number of solutions          ** |
|----------------------------------------------------------|--------------------------------------|---------------------------------------------|-------------------------------------------------------|
|                       $${9=4x+7}$$                       |                                      |                                             |                                                       |
|                       $${y=3y+5}$$                       |                                      |                                             |                                                       |
|                    $${y={x\over2}}$$                     |                                      |                                             |                                                       |
|                     $${3x+6y-9=0}$$                      |                                      |                                             |                                                       |
|    $${x=y}$$                        $${1.25x=1.25y}$$    |                                      |                                             |                                                       |
| $${9.9=6x+8y}$$                        $${9x=2.5y-8.8}$$ |                                      |                                             |                                                       |
| $${11x-2y=1.5}$$                        $${11x-2y=2.5}$$ |                                      |                                             |                                                       |
Problem 2
Kim has a small container and a large container as shown.
[IMG]
It takes 16 of the small containers to fill the large container. Three small containers leave 1.95 gallons of space in the big container.
What is the size of each of the two containers?


Answer: 
Yes. The last three rows of the table in the first problem involves solving pairs of simultaneous linear equations. The second word problem can also be represented as two simultaneous linear equations.

Now, determine whether the following problem or activity can enable students to understand the concepts or skills in the provided description.

shot_info: fl_problem_000972_pos_0

6

fl_problem_001097_pos_0

7

fl_problem_001392_pos_0

8
standard_description: Understand the concept of a unit rate a/b associated with a ratio a:b with b ≠0, and use rate language in the context of a ratio relationship. For example, “This recipe has a ratio of 3 cups of flour to 4 cups of sugar, so there is 3/4 cup of flour for each cup of sugar.” “We paid $75 for 15 hamburgers, which is a rate of $5 per hamburger.” (Expectations for unit rates in this grade are limited to non-complex fractions.)
problem_activity: Hummingbird feeders can be filled with a simple sugar water mixture. Two different recipes are shown below.
|                  |   Water (cups)   | Sugar (cups) | $$2$$ | $$\frac{1}{2}$$ | $$4$$ | $$1$$ | $$16$$ | $$4$$ | $$28$$ | $$7$$ | $$32$$ | $$8$$ |   | Water (cups) | Sugar (cups) | $$2\frac{2}{3}$$ | $$1$$ | $$4$$ | $$1\frac{1}{2}$$ | $$8$$ | $$3$$ | $$24$$ | $$9$$ | $$32$$ | $$12$$ |
|------------------|------------------|--------------|-------|-----------------|-------|-------|--------|-------|--------|-------|--------|-------|---|--------------|--------------|------------------|-------|-------|------------------|-------|-------|--------|-------|--------|--------|
|   Water (cups)   |   Sugar (cups)   |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$2$$       | $$\frac{1}{2}$$  |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$4$$       |      $$1$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$16$$      |      $$4$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$28$$      |      $$7$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$32$$      |      $$8$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|   Water (cups)   |   Sugar (cups)   |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
| $$2\frac{2}{3}$$ |      $$1$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$4$$       | $$1\frac{1}{2}$$ |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$8$$       |      $$3$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$24$$      |      $$9$$       |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
|      $$32$$      |      $$12$$      |              |       |                 |       |       |        |       |        |       |        |       |   |              |              |                  |       |       |                  |       |       |        |       |        |        |
Compare the two different recipes. Which recipe is more sugary? Justify your response.


aligns: no