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[tex] \frac{a}{2} = \frac{b}{5} , \frac{b}{3} = \frac{c}{4} si a+b+c=410
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Răspuns :

a/2 =b/5  ;    a =2b/5
b/3 =c/4  ;     c =4b/3
a+b+c =410

2b/5 + b + 4b/3 =410   numitor 15
6b+15b+20b =6150
41b =6150
b =150
a =2b/5 =2*150/5 =60
c =4b/3 =4*150/3 =200

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