Question

Before the sale, the store had 100 pairs of flip flops in stock. After selling some, they notice that 3/5 of the flip flops they have left are blue. If the store has 39 pairs of blue flip flops, how many pairs of flip flops (any color) have they sold?

Answer 1

35

Explanation:

Given that:

Initial number of flip flop pairs = 100

After some sale:

3/5 of flip flops left are blue = 39

The number of flip flops sold :

Let number of flip flops sold = s

Initial number - number sold = number left

Number Sold = (100 - x)

3/5 of What is left = 39

Hence,

3/5 ( 100 - x) = 39

60 - 0.6x = 39

-0.6x = 39 - 60

-0.6x = - 21

x = 21 / 0.6

x = 35