Question

in a two digit number sum of its digit is 7 if 45 is added to the number the digit interchange their places find the number​

Answer 1

Answer:

16

Step-by-step explanation:

Let the two-digit number be 10x+y.

Now, x+y=7----------1

10x+y+45=10y+x

~9x-9y=-45

~x-y=-5-----------2

Adding eq 1 and 2,

2x=2

~x=1

Therefore, y=7-1 or y=6

Therefore, the number is 10(1)+6=16