Competition problem — Geometry — Maths Olympiad Prep

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Geometry Difficulty 2.2 Junior Find the answer

A straight concrete sidewalk is to be $3$ feet wide, $60$ feet long, and $3$ 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?

Pick one

Solution

This is a $1$ yard by $20$ yard by $1/12$ yard sidewalk, so its volume in yards is
$1\times 20\times \frac{1}{12} = 1.\overline{6}.$
Since concrete must be ordered in a whole number of cubic yards, we need $2\rightarrow \boxed{\text{A}}$ .

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