Answer:
15
Step-by-step explanation:
Red : Blue :
3 8
We have 40 blue marbles
Multiply 8 by what to get 40
40/8 =5
So we need to multiply by 5
3*5 8*5
15 40
There are 15 red marbles
15 red marbles
15 red marbles because 40 divided by 8 is 5. since the ratio from red to blue marbles is 3 to 8 this makes us have to multiply 5 x 3 because of how many times 8 goes into 40.
