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number of cars passed the test =
number of cars failed the test =16
in the question total cars are 40 and 60% of them are passed. Therefore only 16 cars have faults.But 28 cars have clutch only faults (Clutch only - 28). So there is contradiction.Therefore question has a an issue. I made the Venn diagram for given information. please checked the question and notify.
Look at number which are circled by red. Those are contradict the venn diagram idea.