Question

Compare the numbers in the following sequence and try to determine what the next number should be.

6, 9, 18, 21, 42, 45, ?

Now When i did the math I thought it might be 54 but I'm not sure can someone help me or tell me if I'm right!

Answer 1

If you examine the numbers in the question above very well, you will discover that thy have a distinctive pattern. The pattern is this, you add 3 to the first number and then you multiply the next by 2. Lets go over the numbers now:
6 + 3 = 9
9 * 2 = 18
18 + 3 = 21
21 * 2 = 42
42 + 3 = 45
45 * 2 = 90
90 + 3 = 93
93 * 2 = 186, etc.
Thus, the next number after 45 is 90.