Pattern next number3,-6,12,4,20,?

Question

In this pattern what number goes where the ? Is

3,-6,12,4,20,?

Answer 1

Here's the pattern....

starts with 3...

subtracts 9, so 3-9 = -6

Adds twice as much which is 18, so -6 + 18 = 12

subtracts 8.... so 12-8 = 4

adds twice as much which is 16, so 4 + 16 = 20

the next step is to subtract 7.... so 20 - 7 = 13.

Then adds twice as much which is 14, so 13 +14 = 27

then subtracts 6... so 27-6 = 21

then adds twice as much which is 12, so 21+12 = 33

So the sequence is 3,-6, 12, 4, 20, 13, 27, 21, 33, 28, 38, 34, 42, 39, 45, 43, 47, 46, 48, 48, 48, 49, 47