Question

in a two digit number the units digit is twice the ten digit if 27 is added to the number tje digit
s interchange their places find the number

Answer 1

Hey.

Here is the answer.

Let the tens digit be x

so unit digit will be 2x

so the number will be 10x + 2x

According to question;

10x + 2x + 27 = 2x(10) + x

or, 12x + 27 = 21x

or, 9x = 27

so, x = 3

So the number = 10(3) + 2(3) = 36

Thanks.

Answer 2

let tenth place of number is x
and unit place is y

so the number is 10x +y ------ ( 1 )

also y =2x

now by adding 27
x becomes y and y becomes x

therefore , 10y +x = 27+ 10x +y

9y -9x =27

y - x =3

but y =2x

therefore 2x -x = 3

x = 3

putting this value above

y = 6


so the number is 36