Question

5. In a two digit number, digit at the ten’s place is twice the digit at units’s place. If the number obtained by interchanging the digits is added to the original number, the sum is 66. Find the number.

Answer 1

let unit place digital=x
then tens places digit no.=2x
ATQ
10(2X)+X. 1ST EQ
then
10(x)+2x+10(2x)+x=66
12x+21x=66
33x=66
x=2
therefore no.=42