Classroom

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 answer:

a =  240
b =  160

Step-by-step explanation:


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

a = 80+b
a = 0.6·(a+b)

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

Row 2 - 0.4 · Row 1 → Row 2
a-b = 80
-0.2b = -32


b = -32/-0.2 = 160
a = 80+b = 80+160 = 240

a = 240
b = 160

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