Science has a positive impact on peoples’ lives.
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
what is the reading Selection, if I may ask?
They can investigate about the topic being persuaded about throughout multiple different sources, they can not act on a whim and be like hey that sounds cool lets do it.