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:

r1=100%+15%=1+10015=1.15 r2=20%=10020=51=0.2  a+b+c=59 a = r1   b c = br2   b  1.15b+b+0.80b=59  1.15 b+b+0.80 b=59  2.95b=59  b=2.9559=20  b=20  a=1.15 b=1.15 20=23
c=0.80 b=0.80 20=16

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