babusona wrote:
If A, B and C are digits and AB#0, what is the value of B?
(1)
AB
+BA
________
AAC
(2) A=1
The second statement is sort of a hint for the first, as to what numbers you should try out, because it's outright clear that second itself is insufficient.
so if A is 1, C must give some number that gives off a carry to the next ( that's the only reason one can explain how B + A = C and A+ B = A, because if we didn't have an extra carry, both should've been C or both A) so C is a number giving some carry to the next. , the next, part, (taking some hints from second statement is easier now, so if A=1 then c = A + B = 1+9; c=0 . 1 carry to (A + B) = 1+ 9 + carry 1 = 11 ( 1 carry goes to the next and final phase) the whole sum comes out as = 110.
AB
BA
------
AAC = 110