Mary is counting the number of minnows in the pond. 40% of the minnows have red bellies, 30% have green bellies and the rest have white bellies. If 20 minnows have red bellies, how many minnows have white bellies? Give the rationale and then the answer.
Let's think step by step. First find the total number of minnows by dividing the number of red minnows by the percentage of minnows that are red: 20 minnows / 40% = 50 minnows. Then subtract the percentages of red - and green - bellied minnows to find the percentage of white - bellied minnows: 100% - 40% - 30% = 30%. Then multiply the total number of minnows by the percentage that have white bellies: 30% * 50 minnows = 15 minnows.. The answer is: 15.

Uncle Jerry wants to reap ripe tomatoes from his garden. Yesterday, he was able to reap 120 tomatoes. Today, he was able to reap 50 more tomatoes than yesterday. How many tomatoes did Uncle Jerry reap? Give the rationale and then the answer.
Let's think step by step. Today, Uncle Jerry reaps 120 + 50 = 170 tomatoes. Therefore, Uncle Jerry reaps a total of 120 + 170 = 290 ripe tomatoes.. The answer is: 290.

Terry's mom brought home 4 different colored dogs from the shelter. The brown dog weighs 4 pounds. The black dog weighs 1 pound more than the brown dog. The white dog weighs twice as much as the brown dog. The grey dog weighs 2 pounds less than the black dog. What's the average weight of all the dogs? 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.
user
Let's think step by step. Since the black dog weighs 1 pound more than the brown dog, the black dog weighs 1 + 4 = 5 pounds. The white dog weighs 4 * 2 = 8 pounds. Because the grey dog weighs 2 pounds less than the black dog, the grey dog weighs 5 - 2 = 3 pounds. The total weight of all dogs is 4 + 5 + 8 + 3 = 20 pounds. The average weight of all the dogs is 20 / 4 = 5 pounds.. The answer is: 5.