Q: Kevin is a fruit vendor. He always sells a total of 50 crates of fruit per week. Last week he sold 13 crates of grapes, 20 crates of mangoes, and the rest were passion fruits. How many passion fruit crates did he sell?
A: Between grapes and mangoes, we have 13 + 20 = 33 crates. The remaining crates are passion fruits, so we have 50 - 33 = 17 crates of passion fruit. The answer is 17.

Q: Over the past five years, on July 4th, the high temperature for Washington, DC has been: 90 degrees in 2020, 90 degrees in 2019, 90 degrees in 2018, 79 degrees in 2017 and 71 degrees in 2016. What is the average temperature for July 4th in Washington, DC over the past 5 years?
A: Over the past five years, the sum of the temperatures was 90 + 90 + 90 + 79 + 71 = 420. To find the average temperature you divide the total temperature (420) by 5, so 420 / 5 = 84 degrees. The answer is 84.

Q: John took a test with 80 questions. For the first 40 questions, she got 90% right. For the next 40 questions, she gets 95% right. How many total questions does she get right?
A:
He gets 40 * .9 = 36 questions right for the first part. For the second part, he gets 40 * .95 = 38 questions right. So he gets a total of 36 + 38 = 74 questions right. The answer is 74.