Andy harvests all the tomatoes from 18 plants that have 7 tomatoes each. If he dries half the tomatoes and turns a third of the remainder into marinara sauce, how many tomatoes are left? Give the rationale and then the answer.
Let's think step by step. First find the total number of tomatoes harvested: 18 plants * 7 tomatoes / plant = 126 tomatoes. Then divide that number by 2 to find how many tomatoes are left undried: 126 tomatoes / 2 = 63 tomatoes. Then divide that number by 3 to find how many tomatoes are turned into sauce: 63 tomatoes / 3 = 21 tomatoes. Then subtract that number from the number of undried tomatoes to find the remaining number of tomatoes: 63 tomatoes - 21 tomatoes = 42 tomatoes.. The answer is: 42.

Mark has two pets, a hare that runs 10 feet/second and a turtle that crawls 1 foot/second. If they're going to run a 20 foot-race, how much of a head start (in seconds) does the turtle need to finish in a tie? Give the rationale and then the answer.
Let's think step by step. We can find how long the hare spends running by dividing the distance of the race by the hare's speed: 20 feet / 10 feet / second = 2 seconds. We can do the same for the turtle: 20 feet / 1 foot / second = 20 seconds. Finally, subtract the hare's run time from the turtle's run time to find the length of the head start the turtle needs: 20 seconds - 2 seconds = 18 seconds.. The answer is: 18.

Hash has nine more than half as many toys as Bill has. If Bill has 60 toys, how many total toys do the boys have? Give the rationale and then the answer.
Let's think step by step. First we need to know what half of Bills toys are, 60 toys / 2 = 30 toys. Hash has 9 toys + 30 toys = 39 toys. Together the boys have 60 toys + 39 toys = 99 toys.. The answer is: 99.