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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

Respuesta :

jsff42
_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 

Answer:

15

Step-by-step explanation:

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