when two digit number KY is multiplied by itself, the result is the 3 digit number ZLK i.e(KY) x(KY) = ZLK. The number that K stands for is
a)1 or 9
b)2 or 6
We can solve this by Elimination.
The answer cannot be (a) sinceWhen a 2-digit number is squared,
the result is the 3-digit number . . . i.e
The number that stands for is:
The answer cannot be (b) because a square cannot end in 2.
The answer cannot be (c) because a square cannot end in 3.
Therefore . . .