A student gets 50% 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 options
A) 90 %
B) 25 %
C) 45 %
D) 55 %
E) 65 %

Rationale: "let the 3 rd subject % = x 50 + 70 + x = 3 * 70 120 + x = 210 x = 210 - 120 = 90 answer : a"
Answer: A