In a wholesaler, ⁸₁₁ of the customers were female. There were 80 more female customers. Within five minutes, some female customers left the wholesaler. As a result, there were ¹₂ as many male customers as female customers. How many female customers left the wholesaler during the five minutes?
Number of female customers = 8 u
Total number of customers = 11 u

Number of male customers
= 11 u - 8 u
= 3 u

8 u - 3 u = 80
5 u = 80

1 u = 80 ÷ 5 = 16

Number of female customers at first
= 8 u
= 8 x 16
= 128

Number of male customers
= 3 u
= 3 x 16
= 48

The number of male customers remains unchanged.
1 p = 48

1 p = 48 ÷ 1 = 48

New number of female customers
= 2 p
= 2 x 48
= 96

Number of female customers who left
= 128 - 96
= 32

Answer(s): 32