Gerald had 20 toy cars. He donated 1/4 of his toy cars to an orphanage. How many toy cars does Gerald have left? Give the rationale and then the answer.
Let's think step by step. Gerald gave away 20 x 1 / 4 = 5 of his toy cars. Therefore, he is left with 20 - 5 = 15 toy cars.. The answer is: 15.

Bobby can deadlift 300 pounds at 13. When he is 18 he can deadlift 100 pounds more than 250% of his previous deadlift. How many pounds did he add per year? Give the rationale and then the answer.
Let's think step by step. His new deadlift is 300 * 2.5 + 100 = 850 pounds. So he added 850 - 300 = 550 pounds to his deadlift. This took 18 - 13 = 5 years. So he added 550 / 5 = 110 pounds per year.. The answer is: 110.

A total of 42 baby sea turtles hatched and are headed to the ocean. One-third of them got swept to the sea by a wave. How many are still on the sand? 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. This many baby turtles are in the ocean: 42 / 3 = 14 turtles. This many baby turtles are still on the sand: 42 - 14 = 28 turtles.. The answer is: 28.