For a large job, a painter is mixing \(2 \frac {1}{2}\)gallons of white paint with every 5 gallons of blue paint. If he uses 10 gallons of blue paint for the job, how many gallons of white paint will he use?
Explanation
If he uses 2 times as much blue as his mixing formula says (that is, 10 gallons instead of 5), then he should use 2 times as much white as the formula says. In other words, he should use \(2 \times 2 \frac {1}{2} = 2 \times \frac {5}{2}= \frac {10}{2}=5\) gallons of white.
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