Brody’s calculator can run for 60 hours on a full battery. Brody has used three quarters of its battery up, and he is about to take a two-hour math exam that will require his calculator the whole time. How many hours of battery will Brody’s calculator have left? Give the rationale and then the answer.
Let's think step by step. Brody’s calculator has 60 * 1 / 4 = 60 / 4 = 15 hours of battery left. After his 2 - hour math exam, Brody’s calculator will have 15 - 2 = 13 hours of battery left.. The answer is: 13.

The number of dishes Sandrine washed was 10 more than the number of bananas Charles cooked. Also, the number of bananas Charles cooked was 3 times the number of pears he picked. If Charles picked 50 pears, how many dishes did Sandrine wash? Give the rationale and then the answer.
Let's think step by step. If the bananas Charles cooked were 3 times the number of pears he picked, then Charles cooked 3 * 50 = 150 bananas. Since all the dishes that Sandrine washed were 10 more than the number of bananas Charles cooked, Sandrine washed 150 + 10 = 160 dishes.. The answer is: 160.

For football season, Zachary wants to buy a new football, a pair of shorts, and a pair of football shoes. The ball costs $3.75, the shorts cost $2.40, and the shoes cost $11.85. Zachary has $10. How much more money does Zachary need? Give the rationale and then the answer.
Let's think step by step. The total cost of the ball, the shorts, and the shoes is $3.75 + $2.40 + $11.85 = $18. Zachary needs $18 − $10 = $8 more.. The answer is: 8.