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a+b+c=90 a,b,c direct proportionale cu 5,12,13

Răspuns :

a+b+c=90

a,b,c ~ 5,12,13.

a/5 = b/12 = c/13 = K

a=5k
b=12k
c=13k.
Acum inlocuim in relatia principala.

5k+12k+13k=90

30k=90
k=90/30
k=3.

a=5k          b=12k           c=13k
a=5*3         b=12*3         c=13*3
a=15.          b=36            c=39

15+36+39=90