What is the ratio of number of students who passed in both Physics and Chemistry to number of studen...........

Quantitative Aptitude (CDS) Case Studies

Consider the following for the next 04 (four) items that follow :
In an examination of Class XII, 55% students passed in Biology, 62% passed in Physics, 60% passed in Chemistry, 25% passed in Physics and Biology, 30% passed in Physics and Chemistry, 28% passed in biology and Chemistry. Only 2% failed in all the subjects.

What is the ratio of number of students who passed in both Physics and Chemistry to number of students who passed in both Biology and Physics but not Chemistry?

7:10

10:7

9:7

7:9

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