Question

A bag contains 3 red marbles. The ratio of red marbles to blue marbles is 3 : 7. Find the number of blue marbles in the bag.

Answer 1

7 blue marbles

Explanation:

because 3:7 equals red:blue so blue = 7

Answer 2

3:7
3=red
7=blue
There are 7 blue marbles in a bag.