Com'on guys! I have given 2 solutions for the problem... u guys still discussing the same thing. I dont know if u guys understood the solution. And by the way.. 2+2 = 22 ..doesn't work in any base.. so no point in trying out bases. It can only be done if u have a coding system which codes such that binary value of 2 + 2 as 22. by the way- freek..its 2 + 2 =22 .. its not that 2 2 =22 - for confused - if it would be in base 10 ( which is used in everyday life).. nobody have raised the query.... its 2 2 = 22 in base 10 considering these are two bits... but here the problem is 2+2 = 22....