A B C x A A = A C 6 C
A must be 1 because if it were as much as 2,
the smallest ABC could be would be 201. Then
we'd have
201 x 22 = 4422 but the product would then have to
start with A=2.
So A=1
So if we perform the multiplication we'd have this:
1BC
x11
1BC
1BC0
1C6C
From the 2nd from the right column in the
addition part, either B+C=6 or B+C=16
if B+C=6 then the 2nd column from the left would be 1+B=C
So we'd have the system of equations
But that has solution B=5/2, C=7/2,
which aren't digits.
So B+C=16 and the only digits that have sum 16 are 7 and 9
Then there'd be 1 to carry to the 2nd column from the left,
so 1+1+B=C or 2+B=C, so B=7 and C=9.
So the solution is:
179
x11
179
1790
1969
Edwin