Question: The teacher divided the students into four groups. One group had 5 students, another 8 students, and the third 7 students. If there were 24 total students, how many students were in the fourth group?
Answer: There are 5 + 8 + 7 = 20 students in the first three groups. There are 24 - 20 = 4 students in the fourth group. The answer is 4.
[Question]A bowl of fruit holds 18 peaches. Four of the peaches are ripe and two more ripen every day, but on the third day three are eaten. How many more ripe peaches than unripe peaches are in the bowl after five days?
[Answer]In 5 days, 2 * 5 = 10 peaches will ripen. With the 4 that were already ripe, there will be 14 peaches that have ripened. Three were eaten, so there will be 14 - 3 = 11 ripe peaches left. There are 18 - 14 = 4 unripe peaches left. Therefore, there will be 11 - 4 = 7 more ripe peaches than unripe peaches in the bowl after five days. The answer is 7.
Q: James visits 20 houses to try and make a sale. He manages to sell something in every house. The next day he visits twice as many houses but only sold to 80% of houses. If he sold two things at each house in each of the two days, how many items did he sell?
A: The second day he visited 20 * 2 = 40 houses. So he sold things at 40 * .8 = 32 houses. So in total he sold things at 20 + 32 = 52 houses. That means he sold 52 * 2 = 104 things. The answer is 104.
Question: Mr. Fortchaud turns on his heater on the 1st of November, 2005. The fuel tank was then full and contained 3,000 L. On January 1, 2006, the tank counter indicated that 180 L remained. Mr. Fortchaud again filled his tank completely. On 1 May 2006, Mr. Fortchaud decided to stop heating and he read 1,238 L on the meter. What the volume of fuel oil that was used between 1 November 2005 and 1 May 2006?
Answer: I calculate consumption between November 1, 2005 and January 1, 2006: 3,000 – 180 = 2820 L. I calculate consumption between January 1, 2006 and May 1, 2006: 3,000 – 1238 = 1762 L. I calculate the total consumption between November 1st and May 1st: 2,820 + 1,762 = 4582 L. The answer is 4582.
[Question]Jade is building a lego tower. She has 100 pieces. Each level has to be 7 pieces wide. If she has 23 pieces left at the end, how many levels is her tower?
[Answer]She used 77 legos because 100 - 23 = 77. She made 11 levels because 77 / 7 = 11. The answer is 11.
[Question]Tom decided to go on a trip. During this trip, he needs to cross a lake, which in one direction takes 4 hours. During this time, Tom needs an assistant to help him with the crossing. Hiring an assistant costs $10 per hour. How much would Tom have to pay for help with crossing the lake back and forth?
[Answer]
Crossing the lake two times (back and forth) would take 4 * 2 = 8 hours. So Tom would need to pay an assistant 8 * 10 = $80. The answer is 80.