- One number is odd.
- One number is a multiple of 5.
- One number is the day of the month of Kyle's birthday.

The key is the part where they say that each number satisfies

*exactly*one of the conditions. That means, for example, if the number 15 were in a combination, we'd have to eliminate that choice, because 15 is both odd and a multiple of 5. It satisfies 2 conditions, but the question said that's not allowed. We can actually eliminate 3 choices just because of this: (B), (C), and (D) all have odd multiples of 5 (25, 15, and 15, respectively).(A) 14-20-13

(C) 15-18-16

(D) 20-15-20

So how do we know whether to pick (A) or (E)? Well, if it were (E), our odd number would be 21, our multiple of 5 would be 30, and that'd mean our day of the month would have to be 34. But no month

*has*34 days.

**So we have to pick (A): 13 is odd, 20 is a multiple of 5, and 14 is a day of the month.**