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2014-08-20T23:45:10+03:00
A+b+c=122

a=75% din b=  75/100 * b=  3/4 * b=  3b/4

a= 3b/4

b= 30% din c=  30/100 * c=  3/10*c=   3c/10

a= 3 * 3c/10 /4=  9c/10/4=  9c/10 * 1/4=  9c/40

a=9c/40

9c/40 + 3c/10 +c =122   aducem la acelasi numitor

9c+12c+40c =4880

61c=4880

c= 80

a= 9*80/40= 9*2= 18

b=3*80/10= 3*8=24
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