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A housepainter mixed 4 gal of red paint with every 3 gal of blue paint in order to make a purple paint. Which
ratio of gallons of red paint to gallons of blue paint will make the same shade of purple paint?

28: 15
15:20
28:21
12:3

Respuesta :

Answer is Choice C

Reason:

The purple paint has 4 parts red and 3 parts blue.

The ratio of red to blue is 4:3

Multiply both parts of that ratio by 7 and we end up with 28:21

The two ratios 4:3 and 28:21 will produce the same shade of purple.

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