Answer : 26

Explanation:

Let's take the first pair, (225, 18)

225 = 2 + 2 + 5 = 9

and 18 = 9 x 2

Similarly, for second pair

5+4+2 = 11

11×2 = 22

For third,

1+7+9 = 17

17×2 = 34

Therefore, for the last pair

5+0+8=13

and hence 13×2 = 26