Individual 20463

There are 59 pupils in the 9th grade. In 9A, there are 15% more pupils than in 9B. In 9C, there are 20% fewer than in 9B. How many pupils are in individual classes?

Correct answer:

a =  23
b =  20
c =  16

Step-by-step explanation:

a = 1.15b
c = b-0.20b

a = 1.15•b
c = b-0.20•b

a+b+c = 59
a-1.15b = 0
0.8b-c = 0

a = 23
b = 20
c = 16

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