Expand your horizons with the diverse and informative answers found on IDNLearn.com. Discover reliable answers to your questions with our extensive database of expert knowledge.
There were 90 runners to start a race.
If 1/3 dropped out, that means only 2/3 of them are left, so we have:
Number remaining after the first round of dropout = [tex]\frac{2}{3} *90 = \frac{180}{3} =60[/tex]
If 2/3 dropped out in the second half, only 1/3 of them are left, so we have
Number remaining after the second round of dropout = [tex]\frac{1}{3} *60 = 20[/tex]
Thus there are 20 runners remaining at the end.