Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 9)
A container holds a mixture of red and blue marbles in a ratio of 2:3. If there are 12 red marbles, how many blue marbles are there?
8
18
24
36
Explanation
Red:Blue = 2:3. If red = 12 (2*6), then blue = 3*6 = 18
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