This question was previously asked in

MP Patwari Previous Paper 17 (Held On: 16 Dec 2017 Shift 1)

Option 3 : 30

**Given :**

30% of students in the math club are in the science club

60% of students in the science club are in the math club.

There are 15 students in the science club

**Calculations :**

Students in science club = 15

Science students in maths club = 60% of 15 = 9 students

Now,

30% of maths students = 9 (Number of students that are in science club are 30% of maths club)

⇒ (30/100) of Maths students = 9

⇒ Maths students = 900/30

⇒ 30

**∴ The number of students in the math club is 30.**