Question

A number consists of two digits.the digit at the teens place is twice that of the digit at the units place.if 18 is subtracted from the number, the digits are reversed.find the number.

Answer 1

Step-by-step explanation:

let the one digit no. be x

ten digit=2x

no.=10(2x)+x

=20x+x

=21x

10x+2x

=12x

21x-18=12x

21x-12x=18

9x=18

x=18/9

x=2

tens digit=2x

=2*2

=4

the number=42