[Question]Tom cannot afford a normal doctor, so he goes to a discount clinic that is 70% cheaper.  It takes two visits, though, instead of 1.  A normal doctor charges $200 for a visit.  How much money does he save?
[Answer]Each of Tom's visits was 200 * .7 = $140 cheaper. So he paid $200 - $140 = $60 per visit. That means he paid $60 * 2 = $120. So he saved $200 - $120 = $80. The answer is 80.
Q: Tina decides to fill a jar with coins. In the first hour she puts in 20 coins. During the next two hours she puts in 30 coins each time. During the fourth hour she puts in 40 coins. During the fifth hour her mother asks to borrow some money so she takes 20 coins out. How many coins are left after the fifth hour?
A: There are 20 coins during the first hour. 30 coins are added during the second and third hours and 40 coins are added during the fourth hour. By the fourth hour there are 20 + 30 + 30 + 40 = 120 coins. The number of coins after giving 20 to her mother is 120 - 20 = 100. The answer is 100.
Question: Sophie buys five cupcakes at $2 each, six doughnuts at $1 each, four slices of apple pie at $2 per slice, and fifteen cookies at $0.60 each. How much does she spend in all?
Answer: Five cupcakes cost 5 x $2 = $10. Six doughnuts cost 6 x $1 = $6. Four slices of apple pie cost 4 x $2 = $8. And, fifteen cookies cost 15 x $0.60 = $9. Therefore, Sophie spends $10 + $6 + $8 + $ 9 = $33. The answer is 33.
[Question]Wendy went to the dentist for a cleaning, two fillings, and a tooth extraction. The dentist charges $70 for a cleaning and $120 for a filling. Wendy’s dentist bill was five times the cost of a filling. What did Wendy pay for the tooth extraction?
[Answer]Wendy’s dentist bill was 5 * $120 = $600. She got two fillings at a cost of 2 * $120 = $240. Thus, Wendy paid $600 - $240 - $70 = $290 for the tooth extraction. The answer is 290.
Q: Tom needs to buy a new gaming system. He trades in his super Nintendo for an original NES. The SNES is worth $150 and the store gives him 80% of that value. He gives $80 and gets back $10 change and a game worth $30. How much was the NES on sale for?
A: He traded in the SNES for 150 * .8 = $120. Including the money he gave, he spent 120 + 80 = $200. He got 10 + 30 = $40 in change. So the NES cost 200 - 40 = $160. The answer is 160.
Question: Mary and her two friends came up with the idea of collecting marbles each day for their play on weekends. From Monday to Friday, Mary collected twice as many red marbles as Jenny and half the number of blue marbles collected by Anie, who collected 20 more red marbles than Mary and twice the number of blue marbles Jenny collected. If Jenny collected 30 red marbles and 25 blue marbles, what's the total number of blue marbles collected by the friends together?
Answer:
If Mary collected twice the number of red marbles collected by Jenny, she got 2 * 30 = 60 red marbles. Anie collected 20 more red marbles than Mary, which is 60 + 20 = 80 red marbles. The total number of red marbles is 60 + 80 + 30 = 170 red marbles. If Anie collected twice the number of blue marbles collected by Jenny, then she got 2 * 25 = 50 blue marbles. Mary collected half the number of blue marbles collected by Anie, thus 1 / 2 * 50 = 25 marbles. The total number of blue marbles collected is 50 + 25 + 25 = 100 blue marbles. The answer is 100.