a) a+b+c = 100 ; a/1=b/3=c/4=(a+b+c)/(1+3+4)=100/8=12,5
a=12,5*1= 12,5 ; b=12,5*3=37,5 , c=12,5*4=50 ;
b) a+b+c = 100 ; a/(5/2) = b/(13/4) = c/(25/6) =
= 100/(5/2+13/4+25/6)=
= 100/[(30+39+50)/12]=120/119
a=5/2*120/119 = 300/119
b=13/4*120/119 = 390/119
c= 25/6*120/119 = 500/119