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2014-02-23T19:14:55+02:00
Notam 180=a+b
4/a=5/b=k
4/a=k
a=k/4
b=k/5
k/4+k/5=180
9k/20=180
9k=3600
k=400
a=400/4=100
b=400/5=80
4 3 4