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

Answer:

The number of blue marbles is 10

Step-by-step 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

$\frac{x}{y}=\frac{2}{5}$ ----> $x=\frac{2}{5}y$ ---> equation A

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

Substitute equation A in equation B

$\frac{2}{5}y+y=35$

Solve for y

$\frac{7}{5}y=35$

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

Find the value of x

$x=\frac{2}{5}(25)=10$

therefore

The number of blue marbles is 10