There were 60 runners to start the race. In the first half of the race, 1/3 of them dropped out. In the second half of the race, 1/4 of the remaining runners dropped out. How many runners finished the race?

In the question, it is already given that the total number of runners in the race is 60 and out of them 1/3 dropped out in the first half. In the second half 1/4 of the remaining runners dropped out.

Now

Total number of runners in the race = 60

Number of runners that dropped out in the first half = 1/3 * 60

= 20

Number of runners remaining = 60 - 20

= 40

Number of runners dropping out in the second half = 40 * 1/4

= 10

Then the number of runners that finished the race = 40 - 10

= 30

Then 30 runners completed the race.

1/3 60 = 20 : 40 runners left : 1/4 40 = 10 : 30 runners left