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2014-04-28T14:01:45+03:00
A=4k
b=10k
c=4k

4k+10k+4k=180
18k=180
k=180:18
k=10

a=4*10
a=40

b=10*10
b=100

c=4*10
c=40
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2014-04-28T14:03:26+03:00
A/4=b/10=c/4
a=4k
b=10k
c=4k
a=c
2a+b=180
2*4k+10k=180
18k=180
k=10
a=c=40
b=100