What is the nexxt number in this sequence?

Question

10 5 8 4 7 3.5 6.5 ?

Answer Choices:

2.5, 1.5, 4.25, 3.25, 3, 5.25

Answer 1

10 5

8 4

7 3.5

6.5 3.25

6.25 3.125

6.125 3.0625

odd terms decrease by 2, then by 1, then by 1/2, then by 1/4, 10,8,7,6.5, 6.25, 6.125

even terms are half the preceding odd term, so 6.5/2 = 3.25

the sequence converges with a limit of pairs of odd and even of 6,3

Answer 2

For each pair of numbers the second number is half of the first, e.g., 5 is half of 10. 6.5 is the first number of the last pair, so the second number would be half of that or 3.25.