<p>The</a> Official SAT Question of the Day</p>
<p>i've never seen this question before.</p>
<p>ok so it said second to last so at 20 mins there was 1 person left.</p>
<p>And after 5 mins the amount of people left was half of the orignial</p>
<p>so</p>
<p>20 min 1
15 min 2
10 min 4
5 min 8
0 min 16 , the number of people from the beginning. </p>
<p>The answer is C. 16.</p>
<p>any other ways i can do this?</p>
<p>i used the same method as shaheiruddin to solve the problem.</p>