Locker Combination #1

At Math Spies Headquarters there is a locker with tools you will need for training. Each of the three numbers is the answer to a problem in this mission.  Good luck!

The first number in the locker combination is a two-digit number.  It is even and divisible by 3.  The number is less than 35 and the sum of the digits is 6.

a. 33 
b. 18 
c. 24 
d. 42

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