Marla has to spend 20 minutes driving one way to her son's school, then 70 minutes attending parent-teacher night, then the same amount of time driving home. How many minutes does Marla spend on this errand in total? Give the rationale and then the answer.
Let's think step by step. First multiply Marla's one - way driving time by 2 to find her total driving time: 20 minutes * 2 = 40 minutes. Then add Marla's driving time to the time spent attending the conference to find the total time: 70 minutes + 40 minutes = 110 minutes.. The answer is: 110.

Dale and Andrew had breakfast at a cafe. A slice of toast costs £1, and eggs cost £3 each. Dale had 2 slices of toast and 2 eggs. Andrew had 1 slice of toast and 2 eggs. How much did their breakfast cost? Give the rationale and then the answer.
Let's think step by step. The cost of Dale's toast is 2 × $1 = $2. The cost of Andrew's toast is 1 × $1 = $1. The cost of Dale's eggs is 2 × $3 = $6. The cost of Andrew's eggs is 2 × $3 = $6. Their breakfast cost $2 + $1 + $6 + $6 = $15.. The answer is: 15.

Emily spent X dollars on Friday, twice that amount on Saturday, and then three times X on Sunday. Over the three days, she spent $120. What is the value of X, in dollars? Give the rationale and then the answer.
Let's think step by step. She spent X dollars on Friday. She spent 2X dollars on Saturday. She spent 3X dollars on Sunday. X + 2X + 3X = 120. 6X = 120. X = 20.. The answer is: 20.