Question

Cal Q. was given a pair of two-digit integers to multiply. The four digits which formed these two integers were all distinct. Cal mistakenly reversed the digits of both numbers, but still obtained the correct product. How many pairs of integers could have been given?

Answer 1

Answer:

Step-by-step explanation:

Hi All,

This question can be solved by TESTing VALUES:

We're told that X and Y are both 2-digit positive integers with the digits reversed. We're asked for what MUST be a factor of X+Y

IF....

X=12

Y=21

X+Y = 12+21 = 33

Only one of the answers is a factor of 33...