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2014-03-21T18:04:19+02:00
A+b+c+d=80
a=b+2
c=a x 4
d=a+b+c
a,b,c,d=?
daca a+b+c=d => d+d=80
2d=80
d=40
a+b+c=40
a+b+4a=40
b+2+b+4b+8=40
6b=40-10
6b=30
b=5 => a=7 => c=28
1 4 1