Q: What is the next number in the series 10 20 27 54 61?

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The next number in the series 1 2 4 8 10 20 22 is

10

10

5

10.

10

30

10

Each number is multiplied by negative 2 to get the next number. 5 x -2 = -10 -10 x -2 = 20 20 x -2 = -40 -40x -2 = 80 So the next logical number in the series 5 10 20 -40 would be 80.

10 ten

7

20

20

hat is the next number in the series: 60 30 20 15 12

24

16*3 = 48

10

10

22 (2+2=4x2=8+2=10x2=20+2=22

44

44

10 20 30 20 10 it can form reverse order if the series ends here.. else 10 20 30 20 50 like adding 20 to every odd placed term.

10 4 3 11 15 9 8 16 20....

The next number is 20.

10 is one possibility.