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2014-08-25T14:00:46+03:00
A,b,c         dp  cu 2,5,7

a/2=b/5=c/7
a=2k
b=5k
c=7k

a+b+c=240
2k+5k+7k=240
14k=240

k=240/14= 120/7

a=2* 120/7= 240/7
b=5*120/7= 600/7
c=7*120/7=120