If 10 balloons cost $0.15, how much would 50 balloons cost?

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Answer 1 · 2016-11-30T13:15:41

50 balloons will cost 75 cents.

This can start by looking at a ration:

$0.15 : 10 balloons = c : 50 balloons where c is the cost.

Rewriting and solving gives:

$($0.15)/(10 ballo ons) = c/(50 ballo ons)$

$(50 ballo ons) * ($0.15)/(10 ballo ons) = (50 ballo ons) * c/(50 ballo ons)$

$(50 cancel(ballo ons)) * ($0.15)/(10 cancel(ballo ons)) = cancel(ballo ons) * c/cancel(ballo ons))$

$(50 * $0.15)/10 = c$

$c = 5 * $0.15$

$c = $0.75$ or 75 cents