Answer will be 53
Formula ab = (a+b)(b-a)
If 40 * 14 = 11, 30 * 13 = 12, 20 * 12 = 6 then 10 * 11 = ??
If;
1 + 9 + 11 = 1 &
12 + 11 + 9 = 1
Then;
14 + 11 + 9 = ?