Question: A school does a yearly tree planting activity. This year, the 4th graders planted a total of 30 trees while 5th graders planted twice as many. The 6th graders planted 30 fewer than thrice the number of trees planted by the 5th graders. How many trees did they plant altogether?
Answer: The 5th graders planted 30 x 2 = 60 trees. Thrice the number of trees planted by the 5th graders is 60 x 3 = 180. So, the 6th graders planted 180 - 30 = 150 trees. Therefore, they planted a total of 30 + 60 + 150 = 240 trees. The answer is 240.

Question: Half of all the people in Nantucket will attend a planned meeting for a bowl game. There are 300 people in Nantucket, and the number of males going to the meeting is twice the number of females. How many females are going to the meeting?
Answer: If half of the people in Nantucket are going to the planned meeting, then there are 1 / 2 * 300 = 150 people going to the meeting. If the number of males going to the meeting is twice the number of females, we'll assume the number of females is x and the number of males is 2x. We know that x + 2x = 150. Adding like terms produces 3x = 150. After dividing both sides by 3, we have x = 150 / 3 = 50. The number of females attending the meeting is x = 50. The answer is 50.

Question: For a class fundraiser, 30 students were asked to bring in 12 brownies each. 20 students were asked to bring in 24 cookies each and 15 students were asked to bring in 12 donuts each. If they sell everything for $2.00 each, how much money will they raise?
Answer: 30 students were asked to bring in 12 brownies so they will bring in 30 * 12 = 360 brownies. 20 students were asked to bring in 24 cookies each so that’s 20 * 24 = 480 cookies. 15 students were asked to bring in 12 donuts each so that’s 15 * 12 = 180 donuts. Together, they have 360 + 480 + 180 = 1,020 treats. If they sell all the treats for $2.00 each then they will make 1020 * 2 = $2,040.00. The answer is 2040.

Question: 24 gallons per second of water flows down a waterfall. If you have an empty basin that can hold 260 gallons of water. The basin leaks water at 4 gallons per second. how long would it take to fill the basin with water from the waterfall in seconds?
Answer:
24 gallons in minus 4 gallons out is 24 - 4 = 20 gallons per second. 260 gallons divided by 20 gallons per second 260 / 20 = 13 seconds. The answer is 13.