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Q: What number is next in this sequence 10 20 30 20?

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next in the sequence: 10,20,30,20

10 is one possibility.

10

80

20

40 5 10 20 40 80 160.......double the number each time.

The next number in the sequence would be 25.

If you mean: 5 10 20 40 then it is 80

10 The sequence is given by xn = 60/n

The next number in the sequence will be 56.

Double it every time and so the next number will be 80

20

Those are the factors of the number 60, in descending order. The next factor is 10.

40.

The next number in the sequence is 20. You are alternately multiplying the previous number by two and then subtracting two.

25 is the next number that appears in that sequence.

500

10,20,30,20

22

The rule is 5 10 15 20 25 30 .... etc and accordingly the next number in the sequence will be 106

50

500

170

20

20