What is the marks in Science ?
Answer: (3) 30
According to the question,
Marks in science = 2 x marks in English . ……………… (1)
The ratio of his marks in English and mathematics = 2 : 3
Let be the marks in English = 2X & Marks in mathematics = 3X
Therefore, marks in science = X (From equation (1) )
The total marks in English, Science & Mathematics = 2X + X + 3X = 180
6X = 180
X = 180/6
X = 30
Hence, the answer is (3) 30.