Question

Aflati nr a si b stiind ca suma lor este 400 si sunt invers proportionale cu numerele 8 si 4 intreg si o doime.

Answer 1

a*8=b*(4+1/2) - regula proportionalitatii inverse => a/(1/8)=b/(2/9)=(a+b)/(1/8+2/9)=400/(25/72)=400*72/25=16*72=1152. a*8=1152 => a=144, b*(9/2)=1152 => b=1152/9*2=256