[Question]In Professor Plum's biology class there are 40 students. Of those students, 80 percent have puppies. Of those who have puppies, 25% also have parrots. How many students have both puppies and parrots?
[Answer]We start with the initial numbers of students, 40 and multiply that by .8 for 40 * 0.8 = 32 who own puppies. That the number of students with puppies, 32, and multiply that by .25 to find out how many own both puppies and parrots, 32 * 0.25 = 8 who own puppies and parrots. The answer is 8. The answer is 8.

[Question]Maisie and Donna dropped off flyers for a neighborhood clean-up day at houses around their neighborhood. Maisie walked down the shorter left street and dropped off 33 flyers. Donna took the long right street on her bicycle and dropped off five more than twice as many flyers as Maisie. How many flyers did Donna drop off?
[Answer]Twice as many flyers as Maisie is 33 * 2 = 66 flyers. Donna dropped off five more than that, so she dropped off 66 + 5 = 71 flyers. The answer is 71.

[Question]Chris is trying to sell his car for $5200 and has gotten two price offers. One buyer offered to pay the full price if Chris would pay for the car maintenance inspection, which cost a tenth of Chris's asking price. The other buyer agreed to pay the price if Chris replaced the headlights for $80 and the tires for three times as much. What is the difference between the amounts Chris will earn from the two offers?
[Answer]Chris would earn 5200 - 5200 / 10 = 5200 - 520 = $4680 from the first buyer. He would earn 5200 - 80 - 80 * 3 = 5200 - 80 * 4 = 5200 - 320 = $4880 from the second buyer. The difference between Chris's earnings would be 4880 - 4680 = $200. The answer is 200.

[Question]The Donaldsons pay $15 per hour for babysitting. The Merck family pays $18 per hour and the Hille family pays $20 per hour for babysitting. Layla babysat for the Donaldsons for 7 hours, the Merck family for 6 hours and the Hille family for 3 hours. How many dollars did Layla earn babysitting?
[Answer]
Donaldsons pay $15 / hour = 15 * 7 = $105. The Mercks pay $18 / hour = 18 * 6 = $108. The Hilles pay $20 / hour = 20 * 3 = 60. The total amount Layla earned is 105 + 108 + 60 = 273. Layla earned $273 for babysitting. The answer is 273.