Question

The ratio of red marbles to blue marbles in a box is 2:5. What is the ratio of number of blue marbles to the total number of marbles in the box?

• A. 5:7
• B. 2:7
• C. 5:2
• D. 2:5

Answer 1

The correct option is A 5:7

Suppose the number of red marbles is $2x$ and that of blue marbles is $5x$. Hence, total number of marbles will be $7x$.

Now, the ratio of blue marbles to total marbles = 5:7.