In a supermarket, ⁸₁₁ of the customers were male. There were 85 more male customers. Within five minutes, some male customers left the supermarket. As a result, there were ¹₂ as many female customers as male customers. How many male customers left the supermarket 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 = 85
5 u = 85

1 u = 85 ÷ 5 = 17

Number of male customers at first
= 8 u
= 8 x 17
= 136

Number of female customers
= 3 u
= 3 x 17
= 51

The number of female customers remains unchanged.
1 p = 51

1 p = 51 ÷ 1 = 51

New number of male customers
= 2 p
= 2 x 51
= 102

Number of male customers who left
= 136 - 102
= 34

Answer(s): 34