hahaha, ram ram ram ..this is sooo easy..read carefully what she said, "lso she said that it may be in binary or other numbering system", sooo dude, make up ur own numbering system..maybe its base 18 numbering system .. 2+2 =22 so in base 18 number system second 2 remains two whereas the first two is, how 18 time s 1 is 18 plus 2 is 20... so its 22..get it :) 2+(18^1)+ 2+(18^0) = 22 easy as that..:)