Question

b part.


it was a little tricky please help​

Answer 1

Hello!.

let the no: in ten's place be "X" and that in unit place be "y" .The original no: is 10x+ y

Given

2y+ 2 = X

X- 2y = 2 ........... (1)

Also:

no: formed by interhanging the digits is 10y+ x

10y+x = 5+3 (x+y)

10y+x = 5+ 3x+ 3y

2x- 7y = -5 ...........(2)

multiplying eq. 1 & 2

2*(x-2y =2)

2x -4y= 4 ..............(3)

solving eq. 2&3

2x -7y = -5

2x-4y = 4

------------------

-3y = -9

y= 3

x-2y = 2

x-6 = 2

x= 2 +6 = 8

10x + y = 10(8) +3 = 83

the no. is 83.

hope it helps you