Question

digit in the tens place is 4 less than twice the digit in the units place sum of original mom and interchanged no . is 55 find no. ?

Answer 1

Answer: 23

Step-by-step explanation:

let m be the ones digit and n be the tens digit

then n=2m-4 ......(1)

original number is 10n+m and the interchanged number is 10m+n

their sum is 55

so (10n+m) + (10m+n) = 55

11m + 11n = 55

11(m+n)=55

m+n=5

m + 2m - 4 = 5 [using equation (1)

3m = 9

m=3

from (1), 1=2x3-4 = 2

So the original number is 23