# Sparrow ball

On the sparrows ball were males and females. There were 170 sparrows. Males was 20 more than females. How many sparrow female was at a ball?

Result

b =  75

#### Solution:

$170 = a+b \ \\ a = 20 + b \ \\ \ \\ 170 = 20 + b + b \ \\ b = \dfrac{ 170 - 20 }{2} = 75$

170 = a+b
a = 20 + b

a+b = 170
a-b = 20

a = 95
b = 75

Calculated by our linear equations calculator.

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