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There are a total of 47 pupils in three classes in the rural school. There are 20% more pupils in the first grade than in the second grade and one pupil less in the third grade than in the second grade. How many students are there in each class?

Correct answer:

a =  18
b =  15
c =  14

Step-by-step explanation:

r=100%+20%=1+10020=1.2  a+b+c=47 a=r b c=b1 a+b+c=47 a=1.2 b c=b1  a+b+c=47 a1.2b=0 bc=1  Row2Row1Row2 a+b+c=47 2.2bc=47 bc=1  Row32.21 Row2Row3 a+b+c=47 2.2bc=47 1.455c=20.364  c=1.4545454520.36363636=14 b=2.247+c=2.247+14=15 a=47bc=471514=18  a=18 b=15 c=14

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