How many even integers n, such that 20<=n<=180 are of the form 3k+4, where k is any natural number?  Pick one.
A) 24
B) 27
C) 30
D) 33
E) 36
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 27.
<result>B</result>
How many even integers n, such that 20<=n<=180 are of the form 3k+4, where k is any natural number?