Răspuns :

Miky93id
3p+2c=38
5p-20=c

3p+2(5p-20)=38

3p+10p-40=38

13p=38+40
13p=78
p=6 lei

6*5-20= 30-20=10-lei costa un caiet
3p+2c = 38
5p = c + 20 => c = 5p-20

3p+ 2(5p-20) = 38
3p + 10p-40=38
13p=78
p=6 lei
c = 30-20=10lei

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