Mathematics for IGCSE & O level - Ratio And Proportion (Section 1 - No. 48)
A mixture of paint is made by mixing red paint and white paint in the ratio 1:3. If 40 liters of paint are made, how much white paint is used?
10 liters
20 liters
30 liters
40 liters
Giải thích
The total ratio parts are 1 + 3 = 4. White paint constitutes 3/4 of the mixture. (3/4) * 40 liters = 30 liters.