In an intercollegiate competition that lasted for 3 days, 185 students took part on day 1, 150 on day 2 and 200 on day 3. If 100 took part on day 1 and day 2 and 110 took part on day 2 and day 3 and 50 took part on all three days, how many students took part only on day 3?
Choose one.
A) 45  B) 35  C) 55  D) 30  E) 40
Day 1&amp;2 = 100; Only Day 1&amp;2 (100-50) = 50,   Day 2&amp;3 = 110; Only Day 2&amp;3 (110-50) = 60,   Only Day 3 = 200 - (50+60+50)= 
<gadget id="calculator">200 - (50+60+50)</gadget>
<output>40</output>
40   Answer:40
<result>E</result>
In an intercollegiate competition that lasted for 3 days, 185 students took part on day 1, 150 on day 2 and 200 on day 3. If 100 took part on day 1 and day 2 and 110 took part on day 2 and day 3 and 50 took part on all three days, how many students took part only on day 3?