(a,b,c,d)i.p(0,(6);0,75;0,8;0,8(3)
a+b+c+d=3804
a*6/9=b*75/100=c*8/10=d*75/90=k
a=9k/6=3k/2
b=100k/75=4k/3
c=10k/8=5k/4
d=90k/75=6k/5
3k/2+4k/3+5k/4+6k/5=3804
aducem la acelasi numitor, numitorul fiind 60
(90k+80k+75k+72k):60=3804
317k:60=3804
k=60*12
k=720
a=720*3/2=1080
b=4*720/3=960
c=5*720/4=900
d=6*720/5=864
