It takes 320 rose petals to make an ounce of perfume. If each rose produces 8 petals, and there are 12 roses per bush, how many bushes will Fern have to harvest to make 20 12-ounce bottles of perfume? Give the rationale and then the answer.
Let's think step by step. First find the number of roses needed for one ounce of perfume: 320 petals / 8 petals / rose = 40 roses. Then multiply the number of roses needed for one ounce by the number of ounces per bottle to find the number of roses per bottle: 40 roses / ounce * 12 ounces / bottle = 480 roses / bottle. Then multiply that number by the number of bottles to find the total number of roses needed: 480 roses / bottle * 20 bottles = 9600 roses. Then divide that number by the number of roses per bush to find the number of bushes Fern needs to harvest: 9600 roses / 12 roses / bush = 800 bushes.. The answer is: 800.

Grace just started her own business. Each week, she charges 300 dollars. Grace's client will pay her every 2 weeks. How many weeks will it take for Grace to get 1800 dollars? Give the rationale and then the answer.
Let's think step by step. Every two weeks, Grace will get 300 * 2 = 600 dollars. It will take Grace 1800 / 600 = 3 2 - week intervals to get 1800 dollars. It will take Grace 3 * 2 = 6 weeks in total.. The answer is: 6.

Carolyn counts 6 monkeys and 6 birds in the tree outside her window. Then two of the monkeys each eat one bird. What percent of the animals outside her window are monkeys now? Give the rationale and then the answer.
Let's think step by step. First find the new number of birds: 6 birds - 2 birds = 4 birds. Then find the new total number of animals: 6 monkeys + 4 birds = 10 animals. Then divide the number of monkeys by the number of animals and multiply by 100% to express the answer as a percentage: 6 monkeys / 10 animals * 100% = 60%.. The answer is: 60.