Several students are studying together for an exam. 60% of the students who studied less than 10 hours a week feel unprepared. 80% of students who studied 10 hours or more each week feel prepared. If 75% of the students studied less than 10 hours per week, what percent of the students feel prepared for the exam? Choose the correct choice from the following choices:
A) 20
B) 25
C) 30
D) 35
E) 50
Let's say there are 100 students.   Students who studied &lt;10 hrs = 75% = 75   So students who studied =&gt;10hrs = 25   Given: 60% of the students who studied less than 10 hours a week feel unprepared.   So 40% of 75 (=30) feel prepared   Given: 80% of students who studied 10 hours or more each week feel prepared.   So 80% of 25 (= 20) feel prepared   Total   (30 + 20)= 
<gadget id="calculator">  (30 + 20)</gadget>
<output>50</output>
50 out of 100 feel prepared. 50% feel prepared   ANSW50R:50
<result>E</result>
Several students are studying together for an exam. 60% of the students who studied less than 10 hours a week feel unprepared. 80% of students who studied 10 hours or more each week feel prepared. If 75% of the students studied less than 10 hours per week, what percent of the students feel prepared for the exam?