Question

The number 642 is added to a 3-digit number 7x2 to give a 4-digit 13y4 which is exactly divisible by 11. Find xy.
A) 8
B) 12
C) 6
D) None of these

Answer 1

Answer:

Step-by-step explanation:

By equating eqn 1 u get.... 4+x=y

And for divisibility by 11 the sum of odd place digit =the sum of even place digit,,

1+y=7

Y=6....from eqn 1,,x=2

xy= 12