Question

Determinati numerele a,b si c,care sunt invers proportionale cu 2 ,4 si 3 si verifica relatia a+2b+c=80.Pls!!!!!

Answer 1

2a=4b=3c=K
=> a= K/2
b=K/4
c=K/3
=> K/2 +2•K/4+K/3=80
K/2+K/2+K/3=80
3K+3K+2K/totul supra/6 =80
8K=80•6
8K=480
K=60
=>a=30
b=15
c=20