In a wholesale centre, ⁷₉ of the customers were female. There were 80 more female customers. Within five minutes, some female customers left the wholesale centre. As a result, there were ²₅ as many male customers as female customers. How many female customers left the wholesale centre during the five minutes?
Number of female customers = 7 u
Total number of customers = 9 u

Number of male customers
= 9 u - 7 u
= 2 u

7 u - 2 u = 80
5 u = 80

1 u = 80 ÷ 5 = 16

Number of female customers at first
= 7 u
= 7 x 16
= 112

Number of male customers
= 2 u
= 2 x 16
= 32

The number of male customers remains unchanged.
2 p = 32

1 p = 32 ÷ 2 = 16

New number of female customers
= 5 p
= 5 x 16
= 80

Number of female customers who left
= 112 - 80
= 32

Answer(s): 32