A crew works 6 days of 9 hours each and 2 days of 5 hours each. How many hours were worked in total?

Correct answer to question 58 (Arithmetic Reasoning): 64 hours

Method

Multiply within each block before adding: 6 x 9 = 54 and 2 x 5 = 10, so the total is 64 hours. Adding the days first and multiplying gives 112, the classic order-of-operations error.