Question

A number has 2-digit.the unit digit of the number is 3 times the tens digit. if the digits are reversed the new number thus formed is 36 more than the original number. find the original number

Answer 1

Let unit digit be 3x
Tens digit x
No. 10x+3x=13x
Unit digit x
Tens digit 3x
New no. 31x
Now,31x=13x+36
18x=36
X=2
Original no. =26