What number is needed to complete the pattern below? 5, 10, 3, 15, 20, 13, 25, 30, __?

Solution:

The given pattern is

5, 10, 3, 15, 20, 13, 25, 30, __

To solve the question, we have to find the progression of the series

We see that there are three alternate series 

Here 1st, 4th and 7th numbers increase with 10

5 + 10 = 15

15 + 10 = 25

Here 2nd, 5th and 8th numbers increase with 10

10 + 10 = 20

20 + 10 = 30

Here 3rd, 6th and 9th numbers increase with 10

3 + 10 = 13

10 should be added to the 6th number to find the term which is missing.

13 + 10 = 23

Therefore, the number needed to complete the pattern is 23.

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What number is needed to complete the pattern below? 5, 10, 3, 15, 20, 13, 25, 30, __?

Summary:
The number needed to complete the pattern 5, 10, 3, 15, 20, 13, 25, 30, __ is 23.