[Question]: A public official wants to donate 5 new soccer balls per each class in two schools. Each school has 4 elementary school classes and 5 middle school classes. How many soccer balls would the public official donate in all?
[Answer]: Each school has 4 + 5 = 9 classes. So, there are a total of 9 x 2 = 18 classes for the 2 schools. Therefore, the public official donates a total of 18 x 5 = 90 soccer balls.
So the answer is 90.

[Question]: Marta works on her grandparent's farm to raise money for a new phone. So far, she has collected $240. For every hour she works, she receives $10. Her grandmother often gives her tips, and she has collected $50 in tips in total. How many hours has Marta worked on the farm so far?
[Answer]: Ignoring tips, Marta earned $240 - $50 = $190. Therefore, she has worked 190 / 10 = 19 hours.
So the answer is 19.

[Question]: 25% of oysters have pearls in them. Jamie can collect 16 oysters during each dive. How many dives does he have to make to collect 56 pearls?
[Answer]:
First find how many pearls Jamie collects per dive by multiplying the number of oysters by the chance each oyster has a pearl: .25 pearls / oyster * 16 oysters / dive = 4 pearls / dive. Then divide the number of pearls he wants by the number of pearls per dive to find the number of dives: 56 pearls / 4 pearls / dive = 14 pearls / dive.
So the answer is 14.