Number 14713

75% of boys are boys. If four boys came to class, the number of boys would equal the number of girls. How many girls are in the class?

Correct answer:

d =  16

Step-by-step explanation:


c = 0.75 d
4+c = d

c = 0.75·d
4+c = d

c-0.75d = 0
c-d = -4

Row 2 - Row 1 → Row 2
c-0.75d = 0
-0.25d = -4


d = -4/-0.25 = 16
c = 0+0.75d = 0+0.75 · 16 = 12

c = 12
d = 16

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