A paint mixture requires 3 parts red paint to 2 parts blue paint to 4 parts white paint. If you want to make 36 liters of the mixture, how much red paint do you need?
Answer
12 liters
How to solve it
1
Total parts: 3 + 2 + 4 = 9
2
Value per part: 36 ÷ 9 = 4 liters
3
Red paint: 3 × 4 = 12 liters
Hints
Add all ratio parts
Divide total by sum of parts
Multiply red's ratio by this value