Question

Numerele a b c sunt direct proportionale cu 2 3 si 10 aflati numerele stiind ca suma lor este 20

Answer 1

a/2=b/3=c/10=K 
a/2=k ⇒ a=2K
b/3=k ⇒ b=3k
c/10=k ⇒ c= 10k 
dar, a+b+c=20, atunci ⇒ 2k+3k+10k=20 ⇒ 15k=20 simplificam cu 5 ⇒ 3k=4 ⇒ k=4/3 
inlocuim in relatiile a, b, c k-ul obtinut si ⇒
a=2k=2*4/3=8/3=2.66
b=3k=3*4/3=12/3=4
c=10k=10*4/3=40/3=13.33