In a school, three classes took the same examination.class A contained 30 pupils and the average mark for the class was 66.class B contained 22 pupils and the average mark for the class was 56.class C contained 20 pupils.The average obtained by all the pupils together was 1.5.calculate the average mark of class C.

• average marks of c is 60.8
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• For Class A total marks is 66*30=1980
  For Class B total marks is 56*22=1232
  Total avg. is 61.5 and total pupils are 72 so total marks=61.5*72=4428
  now 4428-1980-1232=1216
  avg mark of class C=1216/20=60.8
  
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• ans is 60.5
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