Correct Answer: A
Solution :Let the unit's and ten's digits in the number be y and x respectively. So, the number be\[10x+y\]. According to the question, \[x+y=12\] ?..(1) Also, \[10x+y+18=10y+x\] \[\Rightarrow \] \[9x-9y=-18\]\[\Rightarrow \]\[x-y=-2~\] .....(2) Solving (1) and (2), we get \[x=5\]and \[y=7\] \[\therefore \] Required number is 57.
You need to login to perform this action.
You will be redirected in 3 sec