$6 cost per square foot
You've got $900 to spend on a new deck.
If you work hard enough, you can afford a new deck want to construct a deck 10 feet long and 15 feet wide
let assume X is cost per square foot
long × wide × cost per square foot ≤ money
10 × 15 × X ≤ 900
150 × X ≤ 900
X ≤ 900/150
X ≤ 6
$6 cost per square foot
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