Q: Madison takes her dog to the dog park. Counting Madison's dog, half the dogs have spots and 1/5 have pointy ears. If 15 dogs have spots, how many have pointy ears?
A: First double the number of dogs with spots to find the total number of dogs: 15 dogs * 2 = 30 dogs. Then multiply that number by 1 / 5 to find the number that have pointy ears: 30 dogs * 1 / 5 = 6 dogs. The answer is 6.

Q: Emma buys 2 containers of milk every school day for lunch. She does not go to school on the weekends. How many containers of milk does she buy in 3 weeks?
A: There are 5 school days in a week: 5 days / week x 2 containers of milk / day = 10 containers of milk every week. Finally the number of container for 3 weeks is 3 weeks x 10 containers / week = 30 containers. The answer is 30.

Q: Diane bought twenty more apples than Cecile. If Cecile bought 15 apples, how many apples did they buy altogether?
A:
Diane bought 15 + 20 = 35 apples. Therefore, they bought 15 + 35 = 50 apples altogether. The answer is 50.