# What will be His Percentage of Marks in the Third Subject? If

In an Examination there are three subject of 100 marks each. A student scores 60% in the 1^{st} subject and 80% in the second subject. He scored 70% in aggregate. His percentage of marks in the third subject is:

- 70
- 80
- 60
- 65

**Answer: (1) 70%**

**Explanation:-**

Let be the score of third subject = X

A student of score in first subject = 60% = 60 x 100/100 = 60

A 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 (1) 70%