19
every other number is a 6
and every number inbetween goes up by 5
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21
The next number in the sequence is 15. The pattern is as follows: from 1 to 6 is +5, from 6 to 9 +4, from 9 to 12 +3, from 12 to 14 +2, and then from 14 to the answer (15) +1.
The equation would be as follows: 4x=2x-14 2x=14 x=7
-5
Find the missing number in the series (in red) :2 , 4 , 5, 9, 9 , 16 , 14 , ? , 20 , ….