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2014-11-15T23:48:58+02:00
 \frac{a + b + c}{3}=125
b = a + 3
c = b + 6

a + b + c = 375
c = a + 9
=> a + a + 3 + a + 9 = 375

3*a + 12 = 375
3*a = 363

=>
a = 121
b = 124
c = 130 
2014-11-15T23:49:53+02:00
Ma = (a + b + c) : 3
Ma = 125
(a + b + c) : 3 = 125
a + b + c = 375

b = a + 3
c = b + 6 = a + 3 + 6 = a + 9

a + b + c = 375
a + a + 3 + a + 9 = 375
3a + 12 = 375
3a = 363
a = 121

b = 121 + 3 = 124
c = 121 + 9 = 130