Bogan laid out 10 maggots for her pet beetle. The beetle only ate 1 and Bogan had to throw out the rest. Later that day, she tried feeding again and the beetle ate 3. If Bogan served 20 maggots in total, how many did she attempt to feed the beetle the second time? Give the rationale and then the answer.
Let's think step by step. Bogan served a total of 20 maggots. Bogan gave the beetles 10 maggots in the first feeding. Bogan gave the beetles 20 - 10 = 10 maggots in the second feeding.. The answer is: 10.

Hana sold 4/7 of her stamp collection for $28. How much would she have earned from selling the entire collection? Give the rationale and then the answer.
Let's think step by step. Hana sold 4 / 7 of her collection for $28, so 1 / 7 of her collection represents: 28 / 4 = $7. And as a result, the entire collection represents: 7 * 7 = $49.. The answer is: 49.

A supermarket receives a delivery of 15 cases of tins of beans. Each case contains 24 tins. If 5% of the tins are damaged and thrown away, how many tins of beans are left? Give the rationale and then the answer.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Let's think step by step. The supermarket has 15 cases × 24 tins / case = 360 tins of beans delivered to them. There are 360 tins × 0.05 = 18 tins that are damaged and unsellable. So in the end, there are 360 tins - 18 tins = 342 tins of beans that are left.. The answer is: 342.