Last night, Olive charged her phone for 10 hours. Assuming each hour of charge lasts the phone 2 hours of use, calculate the total time Olive would be able to use her phone before it goes off if she charges it for 3/5 of the time she charged the phone last night. Give the rationale and then the answer.
Let's think step by step. If Olive charges her phone for 3 / 5 of the time she charged the phone last night, the phone would be charged for 3 / 5 * 10 = 6 hours. Assuming each hour of charge lasts the phone 2 hours of use, the phone will last for 6 * 2 = 12 hours before it goes off when Olive uses it on a six hours charge.. The answer is: 12.

A piece of wire 5 feet 4 inches long was divided into 4 equal parts. How long was each part in inches if 1 foot is equal to 12 inches? Give the rationale and then the answer.
Let's think step by step. Five feet is equal to 5 feet x 12 inches / foot = 60 inches. So, the total length of the wire was 60 inches + 4 inches = 64 inches. Hence, each part is 64 inches / 4 parts = 16 inches / part.. The answer is: 16.

Kaylee needs to sell 33 boxes of biscuits. So far, she has sold 12 boxes of lemon biscuits to her aunt, 5 boxes of chocolate biscuits to her mother, and 4 boxes of oatmeal biscuits to a neighbor. How many more boxes of biscuits does Kaylee need to sell? Give the rationale and then the answer.
Let's think step by step. The number of boxes already sold is 12 + 5 + 4 = 21. Kaylee needs to sell 33 21 = 12 more boxes.. The answer is: 12.