The ratio of red marbles to blue marbles in a jar is 3 to 8. There are 40 blue marbles in the jar. How many red marbles are in the jar? A.5 B.15 C.24 D.35

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asked Nov 3, 2018 132k views

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Vas Giatilis · Answer 1 · 2018-11-09T21:28:32+0000

_red_ = _3_ (set up problem)
blue 8

blue=40 R=red (define terms)

_ R_ = _3_ (cross multiply)
40 8

8R=120 (divide by 8 on both sides)

R=15

The answer is B.15

The ratio of red marbles to blue marbles in a jar is 3 to 8. There are 40 blue marbles in the jar. How many red marbles are in the jar? A.5 B.15 C.24 D.35

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