Question

write the number in generalised form of 72​

Answer 1

Answer: Let the original number be 10a + b.

Then, ‘a’ is the tens digit and ‘b’ is the units digit.

Since the sum of the digits is 7,

Therefore a + b = 7,

i.e., b = 7 - a..

So, the original number is 10a + (7 - a).

Therefore, the number obtained by interchanging the digits is

10(7 - a) + a,

and so we have {10(7 - a) + a} — {10a + (7 - a)} = 27.

Solving this equation, we get

a = 2.

And so, b = 7 - 2

= 7 - 2

= 5.

Step-by-step explanation: Please make me the brainleist