The number of subjects where he scored atleast $50 %$ of the marks across all the tests is (type 0 if it cannot be determined) ___

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Solution

$\begin{matrix} S u b j e c t / T e s t & P h y s i c s & C h e m i s t r y & M a t h s & B i o l o g y & T o t a l T e s t 1 & 16 & 11 & 20 - - - & 19 - - - & 66 T e s t 2 & 14 & 19 & 23 - - - & 17 - - - & 73 T e s t 3 & 12 & 20 & 29 - - - & 14 - - - & 75 T e s t 4 & 11 & 18 & 30 - - - & 15 - - - & 74 T e s t 5 & 10 & 22 & 24 - - - & 16 - - - & 72 T o t a l & 63 & 90 & 126 & 81 & 360 \end{matrix}$

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The number of subjects where he scored atleast 50% of the marks across all the tests is (type 0 if it cannot be determined) ___

Subject/TestPhysicsChemistryMathsBiologyTotalTest 1161120–––19–––66Test 2141923–––17–––73Test 3122029–––14–––75Test 4111830–––15–––74Test 5102224–––16–––72Total639012681360

The number of subjects where he scored atleast $50 %$ of the marks across all the tests is (type 0 if it cannot be determined) ___