The ratio of red marbles to blue marbles in a jar is 3 to 8. There are 40 blue marbles in the jar.
2 answers:
Answer:
15
Step-by-step explanation:
_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
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