Pupils 6434

There are 25 pupils in every 5th class in the class, 18% of boys and 23% of girls. How many boys are in the class, and how many girls are there?

Correct answer:

c =  15
d =  10

Step-by-step explanation:


c+d = 25
0.18 c + 0.23 d = 25/5

c+d = 25
0.18·c + 0.23·d = 25/5

c+d = 25
0.9c+1.15d = 25

Row 2 - 0.9 · Row 1 → Row 2
c+d = 25
0.25d = 2.5


d = 2.5/0.25 = 10
c = 25-d = 25-10 = 15

c = 15
d = 10

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