Perhaps there are 3 interleaved series

10 30 15

16 48 24

25

After that, the series degenerates into mixed numbers with increasingly complicated fractions.

According to the above definition, the next number is 75.

- the second number is 3 times the first
- the third number is 1/2 the second
- the fourth number is 1 more than the third.

10 30 15

16 48 24

25

**75**37.5After that, the series degenerates into mixed numbers with increasingly complicated fractions.

According to the above definition, the next number is 75.