Mathematics 0580 · IGCSE · Ratio and proportion

Ratio and proportion — practice question

The bag has only red marbles, green marbles and blue marbles. The ratio of the counts of the three colours is red : green : blue = $12 : 5 : 2$. The number of red marbles is 112 greater than the number of green marbles.
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Work out how many blue marbles there are.

Worked solution & mark scheme

This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Method: uses $\frac{112}{12-5}$.” …

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