Marla is mixing a particular shade of lilac that's 70% blue paint, 20% red paint, and the rest white paint. If she adds 140 ounces of blue paint, how many ounces of white paint does she add?
Thoughts? Step-by-step reasoning:
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First find the total amount of paint Marla mixes by dividing the amount of blue paint by the percentage of the paint that's blue: 140 ounces / .7 = 200 ounces. Then multiply the total amount of paint by the percentage that's white to find the number of white ounces: 200 ounces * 10% = 20 ounces.
Thus, the answer is 20.
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