A student gets 60% in one subject, 70% in the other. To get an overall of 70% how much should get in third subject.
Choose the correct choice from the following choices: A) 75 % B) 80 % C) 45 % D) 55 % E) 65 %

Rationale: "let the 3 rd subject % = x 60 + 70 + x = 3 * 70 130 + x = 210 x = 210 - 130 = 80 answer : b"
Answer: B