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2014-03-10T17:22:34+02:00
A supra3=b supra11=c supra5=k
3a=9k
b=11k
2c=10k 
   9k+11k+10k=300
   30k=300
   k=10
a=30
b=110
c=50
2014-03-10T17:53:05+02:00
A=3k 
b=11k 
c=5k
3xa+b+2c=300
9k+11k+10k=300
30k=300
k=10
a=10x3=30
b=11x10=110
c=5x10=50