Question

the digit at the tens place of a two digit number is 3 times the digit at the units place if the digits are rivers in the new number will be 36 less than the original number find the number

Answer 1

Let unit's place digit = x
Ten's place digit be = 3x

Number = x * 1 + 3x * 10 = 31x

By reversing digits,
Number= x * 10 + 3x * 1 = 13x

13x = 31x - 36
31x - 13x = 36
18x = 36
x= 2

Original Number = 31 x = 31* 2 = 62