2010 AMC 10A Problem 1 — Solution | LIVE by Po-Shen Loh

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2010 AMC 10A Problem 1

Attempt Problem 1 of the 2010 AMC 10A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2010 AMC 10A solutions, or check the answer key.

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

1.

Mary's top book shelf holds five books with the following widths, in centimeters: $6,$ $\dfrac{1}{2},$ $1,$ $2.5,$ and $10.$

What is the average book width, in centimeters?

$1$

$2$

$3$

$4$

$5$

Answer: D

Concepts:mean decimal

Difficulty rating: 560

Solution:

Adding the five widths gives $6+\dfrac12+1+2.5+10=20.$ The average is $20\div5=4.$

Thus, D is the correct answer.

Problem 2#2 →

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