Question

The difference of the digits of a two-digit number is 7. If the digits are reversed, the new number becomes 9/2 times the original number. Find the number.​

Answer 1

Let the two digit number is represented by xy.Given x + y = 9 when the digits are reversed we get yx. Now yx can also be written as 10y + x since y corresponds to 10th place and x corresponds to unit place.

xy = 10x + y

given 10y + x -10x -y = 9

=> - 9x +9y = 9

=> -x + y = 1. We also know x + y = 9

solving the above equations we get x = 4 and y = 5

=> the number is 45 which when reversed become 54 that is increased by 9.

Hence the digit is 45.

Answer 2

Answer:

the correct answer is 5

Step-by-step explanation:

pls see this

it is the correct ans