Question

Isabell is thinking of a even number between 234 and 250 the sum of the digits is double the digit in the ones place what is Isabell's number

Answer 1

246.

Explanation:

Let the number be 2xy, then

2 + x + y = 2y and y must be even because the whole number is even.

y = 2 + x .

Now x must be even because y is even.

The only 2 numbers which fit are x = 4 and y = 6 so the number is 246.

Checking: 2+4+6 = 12 and 12 = 2*6.