There are eighty more girls in the class than boys. Boys are 40 percent and girls are 60 percent. How many are boys and how many girls?

Correct result:

a =  240
b =  160


a = 80+b
a = 0.6 (a+b)

a = 80+b
a = 0.6•(a+b)

a-b = 80
0.4a-0.6b = 0

a = 240
b = 160

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