binary number!!

The sum of their ages = x + (x+1) + (x+2) = 3x + 3 is divisible by 3.111 111 111(2)
= 2^9 - 1
= 511 years old of the sum of 3 people ages is impossible. 11 111 111(2)
= 2^8 - 1
= 255 is possible but not divisible by 3.1 111 111(2)
= 2^7 - 1
= 127 is possible but not divisible by 3.111 111(2)
= 2^6 - 1
= 63 is divisible by 3.3x+3 = 63
x = 20
Mr wong is 20 years old.11 111(2)
= 2^5 - 1
= 31 is not divisible by 3.1111(2)
= 2^4 - 1
= 15 is divisible by 3.3x+3 = 15
x = 4
Mr wong is 4 years old.111(2)
= 7 is not divisible by 3.11(2)
= 3
3x+3 = 3
x = 0 (rejected).Mr wong is 4 or 20 years old.


2011-03-30 19:54:11 補充：
Missing one case :

11 111 111(2)
= 2^8 - 1
= 255 is possible ,

3x+3 = 255
x = 84

Mr wong is 4 or 20 or 84 years old.

2011-03-31 23:07:32 補充：
I think 86 is the ages of his big sister.

2011-04-01 14:18:03 補充：
If Mr wong is 86 , then his sisters is 87 and 88.

86 + 87 + 88

= 261 = 100 000 101(2)

NOT each dight of the number is 1.

So 86 is wrong.