1997 AMC 8 Problem 22

Below is the professionally curated solution for Problem 22 of the 1997 AMC 8, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1997 AMC 8 solutions, or check the answer key.

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Concepts:volume power scaling of length, area, and volume

Difficulty rating: 1380

22.

A two-inch cube $(2\times 2\times 2)$ of silver weighs $3$ pounds and is worth $\$ 200.$ How much is a three-inch cube of silver worth?

$\$300$

$\$375$

$\$450$

$\$560$

$\$675$

Solution:

The two-inch cube consists of $2^3 = 8$ unit cubes. Each of these unit cubes is worth $200 \div 8 = 25$ dollars. To form a three-inch cube, you need $3^3 = 27$ unit cubes. This means that it is worth $25 \cdot 27 = 675$ dollars.

Thus, E is the correct answer.

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