During the first week of performances of a certain play, 5,400 tickets were sold, all at reduced price. During the remaining weeks of performances, 5 times as many tickets were sold at full price as were sold at reduced price. If the total number of tickets sold was 25,200, how many of them were sold at full price? Choose the correct choice
A) 21,000  B) 19,800  C) 16,500  D) 15,800  E) 8,700
5400 + x = 25200 then x is 19800   our x = 19800 is 6/5 of a certain number X   so 19800 = 6/5 of X ---&gt; 19800 * 5 / 6 --&gt;   ANSWER:16,500
<result>C</result>
During the first week of performances of a certain play, 5,400 tickets were sold, all at reduced price. During the remaining weeks of performances, 5 times as many tickets were sold at full price as were sold at reduced price. If the total number of tickets sold was 25,200, how many of them were sold at full price?