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2014-10-28T14:10:30+02:00
A+b+c+d=1000
a=9
b=4a=9x4=36
b=36
c=7a=7x9=56
c=56
9+36+56+d=1000
101+d=1000
d=1000-101
d=899
2014-10-28T14:10:54+02:00
a + b + c + d = 1000
a = 9
b = 9x4 = 36
c = 9x7 = 63
d = ?
9 + 36 + 63 + d = 1000
108 + d = 1000
d = 1000 - 108
d = 892

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