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2014-06-12T00:02:58+03:00
A=30% din b

a= 30/100 *b = 3/10 *b =3b/10

b=40% din c= 40/100*c= 2/5 *c= 2c/5


a= 3*2c/5 /10=  6c/5/10=  6c/5*1/10=  3c/25

a+b+c=38

3c/25 +2c/5 +c =38   aducem la acelasi numitor
3c+10c+25c=950
38c=950
c=25

a=3*25/25= 3
b=2*25/5= 2*5=10