Answer the following question.
John decides to trade in his stereo system. His old system cost 250 dollars and he got 80% of the value for it. He then buys a system that costs $600 that he gets a 25% discount on. How much money came out of his pocket?
Step-by-step reasoning process: He got 250 * .8 = $200. He gets a 600 * .25 = $150 discount on the second system. So it cost 600 - 150 = $450. So he was 450 - 200 = $250 out of pocket.
The answer is 250.

Answer the following question.
John worked 8 hours a day every day from the 3rd to the 8th, including the 3rd and not including the 8th. How many hours did he work?
Step-by-step reasoning process: He worked for 8 - 3 = 5 days. So he worked for 5 * 8 = 40 hours.
The answer is 40.

Answer the following question.
There are 180 school days in the academic year. Aliyah packs a lunch half the time. Becky packs her lunch half as much as Aliyah. How many days a year does Becky pack her lunch?
Step-by-step reasoning process: Aliyah packs her lunch the time, so in 180 school days / 2 = she packs her lunch 90 times. Becky packs her lunch as much as Aliyah, so 90 times / 2 = 45 times a year.
The answer is 45.

Answer the following question.
Bertha plays tennis. Every ten games, one of her tennis balls wears out. Every five games, she loses a ball. Every four games, she buys a canister of three balls. She started with two balls and gave one to her partner. After twenty games, how many tennis balls does she have?
Step-by-step reasoning process: Bertha wears out 20 / 10 = 2 tennis balls in 20 games. She loses 20 / 5 = 4 tennis balls in 20 games. She buys canisters of 3 * 20 / 4 = 15 tennis balls in 20 games. Bertha started with 2 balls and gave 1 away, so she has 2 + 15 - 2 - 4 - 1 = 10 tennis balls after twenty games.
The answer is 10.