Solve the problem.
-Liz ran 30 mi, 34 mi, and 38 mi during three weeks. How many miles must she run the fourth week to give her an average of 30 miles per week?
A) 33 mi
B) 18 mi
C) 34 mi
D) 30 mi

Question

Quizplus · Accepted Answer

To achieve an average of 30 miles per week over four weeks, Liz needs to run a total of 30 miles/week * 4 weeks = 120 miles. She has already run 30 + 34 + 38 = 102 miles. Therefore, she must run 120 - 102 = 18 miles in the fourth week.

Solve the Problem. -Liz Ran 30 Mi, 34 Mi, and 38 Mi During