Question

the digit in the ones place of a 2-digit number is twice the digit at the tens place. write thr number

Answer 1

it can be 21,42,63 and 84

Answer 2

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Let the number at once place be x
So, At tens place the value is 10×2x
=20x
So,
=20x+x(once place)
=21x

Now, Put the value as 1,2,3 or 4 at x.
So, the number will be
(1) 21×1. =21
(2) 21×2. =42
(3). 21×3. =63
(4). 21×4. =84

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