2016 AMC 8 Problem 3

Attempt Problem 3 of the 2016 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2016 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

3.

Four students take an exam. Three of their scores are 70,70, 80,80, and 90.90. If the average of their four scores is 70,70, then what is the remaining score?
40 40
50 50
55 55
60 60
70 70
Answer: A
Concepts:mean
Small hint:
First find the total score needed for an average of 7070.
Big hint:
Subtract the three known scores from the needed total.
Video solution:
Solution video thumbnail
Play video

Click to load, then click again to play

Written solution:
From the average, we can calculate the sum of the scores to be 4⋅70=280.4 \cdot 70 = 280. This means that the remaining score is 280−70−80−90=40.280 - 70 - 80 - 90 = 40.
Thus, A is the correct answer.
LIVE by Po-Shen Loh
Programs

LIVE Classes

Self-Paced Classes

Stars

Scholarship

About Us

Who Is Po-Shen Loh?

Email Contact

Newsletter

Jobs

Become a Star

For a more Thought Full world.

© 2026 Expii, Inc.