In an Examination there are three subject of 100 marks each. A student scores 60% in the 1st subject and 80% in the second subject. He scored 70% in aggregate. His percentage of marks in the third subject is: Choose the correct answer.
A) 70	B) 80	C) 60	D) 65	E) 66
Explanation :   Let be the score of third subject = X   70 student of score in first subject = 60% = 60 x 100/100 = 60   70 student of score in second subject = 80% = 80 x 100/100 = 80   70% of 300 = 300 x 70/100 = 210   score of third subject = 210 – ( 60 + 80)   = 210 – 140 = 70   Percentage of score in third subject = 70 x 100/100 = 70%   Hence, the answer is 70%   70nswer : 70
<result>A</result>
In an Examination there are three subject of 100 marks each. A student scores 60% in the 1st subject and 80% in the second subject. He scored 70% in aggregate. His percentage of marks in the third subject is: