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2014-11-05T15:31:30+02:00
A + b + c = 121
a = 10c + 5
b = 5c + 4
10c + 5 + 5c + 4 +c = 121
16c = 121 - 9
16c = 112
c = 112 : 16
c = 7
a = 10 * 7 + 5
a = 75
b = 5 * 7 + 4
b = 39
2014-11-05T15:36:54+02:00
A=10c+5,b=5c+4
a+b+c=121
10c+5+5c+4+c=121
16c+9=121
16c=112
c=7
a=10x7+5=75
b=5x7+4=39
75+39+7=121