Subject: mathqa
Question: 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 ?
Option: 
A: 700
B: 500
C: 650
D: 600
Answer: B