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Daca a,b,c sunt direct proportionale cu 2,5,8 iar a+b=14, aflati a,b,c .

Răspuns :

Cristinatibulca
a/2=b/5=c/8=(a+b+c)/(2+5+8)
a/2=b/5=c/8=(14+c)/15
c/8=(14+c)/15
15c=8(14+c), 15c=112+8c
7c=112, c=16

a/2=c/8, a/2=16/8, a/2=2, a=4
b/5=2, b=10

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