In a wholesaler, ⁸₁₁ of the customers were male. There were 75 more male customers. Within five minutes, some male customers left the wholesaler. As a result, there were ¹₂ as many female customers as male customers. How many male customers left the wholesaler during the five minutes?
Number of male customers = 8 u
Total number of customers = 11 u

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

8 u - 3 u = 75
5 u = 75

1 u = 75 ÷ 5 = 15

Number of male customers at first
= 8 u
= 8 x 15
= 120

Number of female customers
= 3 u
= 3 x 15
= 45

The number of female customers remains unchanged.
1 p = 45

1 p = 45 ÷ 1 = 45

New number of male customers
= 2 p
= 2 x 45
= 90

Number of male customers who left
= 120 - 90
= 30

Answer(s): 30