Question

A bag is full of green and red balloons. The
ratio of green balloons to red balloons is 2:5.
There are 84 balloons in the bag, How many
balloons are red?

Answer 1

Unknown constant = x

Number of green balloons = 2x

Number of red balloons = 5x

2x + 5x =  84

7x = 84

x = 12

Number of red balloons = 5 x 12 = 60 balloons