Question

A number contist of two digits. The once digit is 1/2 of the tens digit find the number if the sum of the digit is 6.

Answer 1

let the digit at tens place=x
therefore the digit at unit place=x/2
also x+x/2=6
i.e. x=4
therefore the digit at tens place=x=4
and the digit at unit place=x/2=4/2=2
i.e. the required number=42