Question

There were 54 marbles in total the ratio of green to blue is 7:2 work out the number of green marbles

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Answer 1

42 green marbles

Explanation:

sum the parts of the ratio, 7 + 2 = 9 parts

Divide the number of marbles by 9 to find the value of one part of the ratio.

54 ÷ 9 = 6 ← value of 1 part of the ratio , then

7 parts = 7 × 6 = 42 ← number of green marbles