The total runners who began the marathon is 1000
<u>Explanation:</u>
Given:
Runners who completed the marathon = 90%
Men = 30%
Number of men completed the marathon = 270
Total runners who began the marathon = ?
Let the total runners be x
According to question:
Runners who completed the marathon = 
= 0.9x
and,

Solving further:

Therefore, total runners who began the marathon is 1000
Answer:
D
Explanation:
Choice A would make sense for the first sentence, but not the rest. Choice B is supported by the part of the passage that says, "...I am weightless again, flying past the other runners". The choice C isn't supported whatsoever because the passage does not say whether or not Squeaky wins, nor does it talk about working hard to prepare for the race. The choice D is supported by the positive self-talk and the resulting physical response (running faster) that the passage describes. This is why I believe D is the best answer.
D. Success is possible if one truly believes in oneself