Question

Theresa's parents have agreed to buy her tickets to see her favorite band if she spends an average of $10$ hours per week helping around the house for $6$ weeks. For the first $5$ weeks she helps around the house for $8,$ $11,$ $7,$ $12$ and $10$ hours. How many hours must she work for the final week to earn the tickets?

$9$

$10$

$11$

$12$

$13$

Answer: D

Concepts:mean

Difficulty rating: 560

Solution:

During the first $5$ weeks, Theresa works for a total of $8+11+7+12+10=48$ hours.

She promised to work $10\cdot 6=60$ hours in all.

This means that she has to work $60-48=12$ hours during the final week to earn the tickets.

Thus, D is the correct answer.

2007 AMC 8 Problem 1

Answer: D

Difficulty rating: 560

Solution:

Problem 1 in Other Years