There were 80 runners to start a race in the first half of the race there 2/5 of them dropped out in the second half of the race 1/4 of the remaining members dropped out how many finish the race

8

Step-by-step explanation:

Out of a total of 80 runners, during First half: 2/5 of 80 dropped out

ie (2/5) of 80

= 0.4 x 80 = 32

Of the 32 remaining runners, during Second half 1/4 dropped out

i.e (1/4) of 32

= 0.25 x 32 = 8

Thus, only 8 runners finished the race.

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.