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2014-10-28T16:38:52+02:00


a+b+9+3=115

a+b=115-12=103

a=9b+3

9b+b=103-3=100

10b=100

b=10

a=93


2014-10-28T16:44:19+02:00
A : b = 9 rest 3
a = 9b + 3
a + b + cat + rest = 115
9b + 3 + b + 9 + 3 = 115
10b = 115 - 3 - 9 - 3
10b = 100
b = 100 : 10
b = 10
a = 9 * 10 + 3
a = 90 + 3
a = 93