In the faculty of Reverse-Engineering, 100 second year students study numeric methods, 300 second year students study automatic control of airborne vehicles and 200 second year students study them both. How many students are there in the faculty if the second year students are approximately 40% of the total?  Select:
A) 550 B) 500 C) 600 D) 650 E) 700
Total number of students studying both are 100 + 300 - 200= 
<gadget id="calculator">100 + 300 - 200</gadget>
<output>200</output>
200 (Subtracting the 200 since they were included in the both the other numbers already).   So 40% of total is 200, so 100% is 500   Answer is 500
<result>B</result>
In the faculty of Reverse-Engineering, 100 second year students study numeric methods, 300 second year students study automatic control of airborne vehicles and 200 second year students study them both. How many students are there in the faculty if the second year students are approximately 40% of the total?