[Question]Benny has bought a new piggy bank and wants to start saving money. In January he adds $19, then adds the same amount in February. By the end of March, he has $46. How many dollars did he add to the piggy bank in March?
[Answer]In January and February, Benny added 19 + 19 = $38 to the piggy bank. Calculating the difference between this and the total he has at the end of March shows that he saved 46 38 = $8 in March. The answer is 8.

[Question]A performing magician has a disappearing act where he makes a random member of his audience disappear and reappear. Unfortunately, one-tenth of the time, the audience member never reappears. However, one-fifth of the time, two people reappear instead of only one. If the magician has put on 100 performances of the act this year, how many people have reappeared?
[Answer]One - tenth of the time, no one reappears, so there have been 100 / 10 = 10 times no one has reappeared. One - fifth of the time, two people reappear, so there have been 100 / 5 = 20 times 2 people have reappeared. In those 20 times, 2 * 20 = 40 people have reappeared in all. Thus, there have been 100 - 10 - 20 = 70 times one person has reappeared. Therefore, over 100 acts, 70 + 40 = 100 people have reappeared in all. The answer is 110.

[Question]Jack has been driving for the past 9 years. He drives 37,000 miles every four months. How many miles has Jack driven since he started driving?
[Answer]There are 12 / 4 = 3 four month groups in a year. Jack drives 37,000 * 3 = 111,000 miles in a year. Jack has driven 111,000 * 9 = 999,000 miles since he has started driving. The answer is 999000.

[Question]Jimmy bought 3 pens for school for $1 each, 4 notebooks for $3 each and 2 folders for $5 each. If he paid with a $50 bill, how much change will he get back?
[Answer]
Jimmy spent 3 * $1 = $3 on pens. He spent 4 * $3 = $12 on notebooks. He spent 2 * $5 = $10 on folders. He spent $3 + $12 + $10 = $25 in total. His change will be $50 - $25 = $25. The answer is 25.