Gopal got twice as many marks in Physics as in Chemistry. The proportion of his marks in Physics and Biology is 6 : 5. What are his marks in Chemistry if his total marks in Physics, Chemistry and Biology are 210?

Gopal got twice as many marks in Physics as in Chemistry. The proportion of his marks in Physics and Biology is 6 : 5. What are his marks in Chemistry if his total marks in Physics, Chemistry and Biology are 210?
1). 90
2). 45
3). 48
4). 75

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