Question

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

Answer 1

50 balloons will cost 75 cents.

Explanation:

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