Correct Answer - Option 2 : 75

**Given:**

Marks obtained in Hindi, Chemistry and Mathematics = 150 + marks obtained in Hindi

**Formula used:**

Average = Sum of observations/Number of observations

**Calculation:**

Let the marks obtained by the student in Hindi Chemistry, and Mathematics be H, C and M respectively

⇒ H + C + M = 150 + H

⇒ C + M = 150

Required average = (C + M)/2

⇒ 150/2

⇒ 75

**∴**** The average marks obtained in Chemistry and Mathematics is 75**