Question

15,20,28,18,23,28,21,26,28,?,?

Answer 1

Answer:

15+5=20

20+8=28

28-10=18

18+5=23

23+5=28

28-7=21

21+5=26

26+2=28

Thus,  28-4=24

          24+5=29

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Answer 2

Answer:

28, the 3rd term is constant

Add 3 to the first term and the second term

The series thus goes

15

20

28

15+3 = 18

20+3 = 23

28

18+3 = 21

23+3 = 26

28

21+3 = 24

26+3 = 29