in the faculty of reverse - engineering , 200 second year students study numeric methods , 400 second year students study automatic control of airborne vehicles and 100 second year students study them both . how many students are there in the faculty if the second year students are approximately 60 % of the total ?
"total number of students studying both are 400 + 200 - 100 = 500 ( subtracting the 100 since they were included in the both the other numbers already ) . so 60 % of total is 500 , so 100 % is approx . 834 . answer is a"
add(200, 400)