Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 37)
If the ratio of red to green marbles is 5:9, and there are 45 green marbles, how many red marbles are there?
15
20
25
81
Explanation
Red:Green=5:9. 45 green means 9*5, thus 5*5 = 25
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