Question

Jaime mixes purple paint. She uses three pints of blue paint for every four
pints of red paint. Jaime wants to mix more paint exactly the same color. She
has 14 pints of red paint. How much blue paint does she need?

Answer 1

Let n = pints of blue paint needed

Use ratio and proportion.
3 blue : 4 red = n : 14 red
Rewriting,
3/4 = n/14
n = (3/4) * 14
n = 42/4
n = 21/2 pints of blue paint