[Question]Farmer Randy has 1700 acres of cotton he needs to have planted in 5 days. With a crew of 2 tractors working for 2 days and then a crew of 7 tractors working for another 3 days, how many acres of cotton per day does each tractor need to plant to meet their planting deadline?
[Answer]With 2 tractor teams working for 2 days, this is like 2 * 2 = 4 days worth of work by a single tractor, which they call tractor days. With 5 tractor teams working for 4 days, this is 7 * 3 = 21 tractor days. In total, the effort of all the tractor teams is 4 + 21 = 25 tractor days. If they need to plant 1700 acres with their 25 tractor days, then each tractor team needs to plant 1700 / 25 = 68 acres of cotton per day. The answer is 68.

[Question]A class is 40% boys. The rest are girls. Every boy in class gets an 80% on the math test. Every girl gets a 90%. What is the class average on the test?
[Answer]The class is 60% girls because 100 - 40 = 60. The class average is 86% because .4(80) + .6(90) = 86. The answer is 86.

[Question]Samira is the assistant coach of a soccer team playing against one of the best teams in their league. She has four dozen water bottles filled with water in a box. In the first break of the match, the 11 players on the field each take two bottles of water from Samira's box, and at the end of the game, take one more bottle each. How many bottles of water are remaining in Samira's box?
[Answer]If the box has four dozen bottles of water, there are 4 * 12 = 48 bottles of water in the box. After the first half, the 11 players take 11 * 2 = 22 bottles of water from the box. If they take 11 more bottles of water at the end of the game, the number increases to 22 + 11 = 33 bottles of water taken. Without the bottles taken, there are 48 - 33 = 15 bottles of water remaining in the box. The answer is 15.

[Question]A father and a son start approaching each other at the same time from opposite ends of a hallway that is 16m long. If the father is walking three times as fast as the son, at what distance from the father's end of the hallway will they meet?
[Answer]
Since the father is walking 3 times as fast as his son, their speeds are in a ratio of 3:1 respectively. They started at the same time so they will cover distance at the same ratio of 3:1. Each portion of the distance they covered is 16 / (3 + 1) = 4m. The father covered three portions of the distance which is 3 * 4m = 12m from his end. The answer is 12.