Hey , Help also give a explanation how you got the answer please and thank you.

Answer:
50
Step-by-step explanation:
Total- 90 runners
first half- 1/6 of 90 dropped out, so 15 dropped out.
There are 75 left.
Then, 1/3 of 75 dropped out, so 25
75-25=50
There are 50 runners still in the race
Hope this helps!
let me know if it does and if it was right.