Answer:
27
Step-by-step explanation:
27 is less than 40 and 2+7 = 9. It's also and odd number. 18 isn't it, even though the digits in the number add up to 9, because it's even.
All multiples of 9 have digits that add up to 9. All the rest are above 40 or even so you can eliminate them all right away.
