How many even integers n, such that 20<=n<=180 are of the form 3k+4, where k is any natural number?	Choose the correct choice from the following answers:
A) 24  B) 27  C) 30  D) 33  E) 36

Rationale: the first number is 22 = 16 + 6 ( 1 ) . we can continue adding 6 to make a list : 22 , 28 , 34 , . . . the last number is 278 = 16 + 6 ( 27 ) there are 27 numbers in the list . the answer is b .
Answer: B