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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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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

User Fredrick Pennachi
by
7.6k points

2 Answers

7 votes

Answer:

15

Explanation:

User Jkaram
by
9.0k points
6 votes
_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





User Vas Giatilis
by
8.1k points
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