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?

Correct result:

b =  75


170=a+b a=20+b  170=20+b+b b=170202=75

170 = a+b
a = 20 + b

a+b = 170
a-b = 20

a = 95
b = 75

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