1990 AMC 8 Problem 17
Attempt Problem 17 of the 1990 AMC 8 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 1990 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
17.
A straight concrete sidewalk is to be feet wide, feet long, and inches thick. How many cubic yards of concrete must a contractor order for the sidewalk if concrete must be ordered in a whole number of cubic yards?
more than
Answer: A
Small hint:
First convert inches to feet:
Big hint:
Find the volume in cubic feet, then divide by since cubic yard cubic feet
Solution:
The thickness is inches foot, so the volume is cubic feet.
Since cubic yard cubic feet, this is cubic yards. Rounding up to a whole number, the contractor must order cubic yards.
Thus, the correct answer is A .
Problem 17 in other years
- 1985 AMC 8
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