The ratio of blue marbles to yellow marbles in a jar is 7 to 9. If there are 28 blue marbles in the jar, how many yellow marbles are there?

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asked Jun 2, 2017 51.5k views

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Mara Black · Answer 1 · 2017-06-06T06:58:27+0000

There are 36 yellow marbles.

proportion: a:b = c:d where ad = bc

7:9 = 28:x

7x = 9*28
7x = 252
7x/7 = 252/7
x = 36

7:9 = 28:36
7*36 = 9*28
252 = 252

The ratio of blue marbles to yellow marbles in a jar is 7 to 9. If there are 28 blue marbles in the jar, how many yellow marbles are there?

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