Question

The ratio of blue to red marbles is 2 to 5. If I have a total of 25 marbles , how many would it be blue.

Answer 1

The number of blue marbles is 10

Explanation:

The correct question is

The ratio of blue to red marbles is 2 to 5. If I have a total of 35 marbles , how many would it be blue

Let

x -----> the number of blue marbles

y -----> the number of red marbles

we know that

`(x)/(y)=(2)/(5)` ---->
`x=(2)/(5)y` ---> equation A

`x+y=35` ----> equation B

Substitute equation A in equation B

`(2)/(5)y+y=35`

Solve for y

`(7)/(5)y=35`

`y=35(5)/7\\y=25`

Find the value of x

`x=(2)/(5)(25)=10`

therefore

The number of blue marbles is 10