Claire mowed 5 lawns last week. She mowed each lawn in 7/12 hour. She mowed the same lawns this week in 5/12 hour each using her new lawn mower. How many times longer was Claire's time to mow all the lawns last week than this week? Explain.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.