Problem: 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 ?
Rationale: "total number of students studying both are 100 + 300 - 200 = 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 b"
annotated_formula: add(100, 300)