Question

The unit digit of a two digit number is 3 and seven time the sum.Of digit is the number it self find the number

Answer 1

Unit digit =3

Let the tens digit is X

Number

10×X +3

ATQ

Number = 7× (Sum of digits)

10X+3 = 7×( X+3)

10X+3 =7X+21

3X=18

X=6

So the Number is (10×6 +3 )=63