Question

The sum of digit of a two digit number is 7. after interchanging the digits new no. formed is 25 less than
double of the original number, then find original number​

Answer 1

Answer:

let the digits be x and 7-x

number=70-9x

after interchanging

number=9x+7

140-18x-9x-7=25

-27x+133=25

-27x=-108

x=4

number=70-9x

70-36

34