We have a question: Stacy is a high school Calculus teacher. She assigns 45 problems for homework. There are twice as many multiple choice problems as free response, and 7 more free response than true/false. How many true/false questions are there?
And an answer: 6
So how you got the answer?
Let x represent the number of true / false questions. Free response:x + 7. Multiple choice: 2(x + 7) = 2x + 14. Total:x + x + 7 + 2x + 14 = 45. 4x + 21 = 45. 4x = 24. x = 6 true / false questions.

We have a question: Michael loves to paint and sells his creations. He charges $100 for a large painting and $80 for a small painting. At his last art show, he sold 5 large paintings and 8 small paintings. How much did he earn in all?
And an answer: 1140
So how you got the answer?
He earned 5 x $100 = $500 for the large painting. And he earned 8 x $80 = $640 for the small paintings. Therefore, he earned a total of $500 + $640 = $1140 in all.

We have a question: Laura is planning her wedding. She expects 220 people to attend the wedding, but she has been told that approximately 5% typically don't show. How many people will go to her wedding?
And an answer: 209
So how you got the answer?
Laura expects 100 - 5 = 95% to show up. Laura expects 220 * 0.95 = 209 guests.