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2014-05-11T20:12:55+03:00
A+b+c+d=360
a=3k
b=4k
c=5k
d=6k

3k+4k+5k+6k=360
18k=360
k=360:18
k=20

a=3*20
a=60

b=4*20
b=80

c=5*20
c=100

d=6*20
d=120
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2014-05-11T20:14:00+03:00
A/3=B/4=C/5+d/6=k
A=3k
B=4k
C=5k
D=6k
A=B=C=D=360*
18k=360
k=20*
A=60
B=80*
C=100*
D=120*
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