Question

There are 3 more red marbles than the blue marbles. If the ratio of red to blue marbles is 2:3, the number of blue marbles are .

• A. 3
• B. 6
• C. 9

Answer 1

The correct option is C 9

Ratio of the number of red and blue marbles = 2:3
Total parts = 2 + 3 = 5
So, in the total 5 parts of the marbles, 2 parts are red and 3 parts are blue.

Difference between the number of red and blue marbles = 1 part of the total number of marbles.
Difference between the number of red and blue marbles = 3
So, 1 part = 3 marbles

Number of blue marbles = 3 parts of the total number of marbles
= 3 $\times$ 3 = 9

$\therefore$ There are 9 blue marbles.