in the faculty of reverse - engineering , 300 second year students study numeric methods , 600 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 70 % of the total ?
"total number of students studying both are 300 + 600 - 200 = 700 ( subtracting the 200 since they were included in the both the other numbers already ) . so 70 % of total is 700 , so 100 % is 1000 answer is e"
add(300, 600)