Question

the ratio of tens digits to the units digit of a two digit number is 1:2, if 18is added to the number the digits interchange their places.find the number
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Answer 1

Step-by-step explanation:

Let:

• Tens and Units digit be x and 2x respectively

Solution:

Original number = 10×x+2x=12x

Number after interchanging it's digits =10×2x+x=21x

ACQ

$\therefore$

21x=12x+18

9x=18

x=2

Unit's digit =4

Tens digit=2

Original number =24