Question

first 3 ques answer plz

Answer 1

1) the value of x should be 1,4,7 just add the digits. the sum of the digits should be divisible by 3.

2)the value of should be 5 the sum of digits should be divisible by 9
3) let the digits be x and y.
ATQ x+y=6 -------1
the original no 10x+y
reverse no 10y+x
10y+x-10x-y=18
x-y=2------2
from 1&2
x=4and y=2