Question

which number is equal to twice the sum of its digits​

Answer 1

18 is a number which is equal to twice the sum of its digit

Answer 2

To Find,

Which number is equal to twice the sum of its digits.

Solution,

We can solve the question as follows:

Let the two-digit number be $xy$. Here, $x$ is the ten's place and $y$ is the one's place.

Therefore,

The number can be written as = $10x + y$

(For example, 28 can be written as = $10*2 + 8$ and 42 can be written as $10*4 + 2$)

Now, we have to find a number that is equal to twice the sum of its digits.

$10x + y = 2(x+y)$

$10x + y = 2x + 2y$

$8x = y$

Here, the above equation will satisfy only if $x = 1, y = 8$

Therefore, the number is $= 10*1 + 8 = 18$

Hence, the two-digit number is 18.