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(a) total marks of the 3 subjects = average of 3 subjects * 3

= 68 * 3 

= 204

(b) Total marks of Jenny’s Maths and Science = 72 * 2 = 144

If Jenny score u marks on English,

u = 204 – 144 = 60

So she scored 60 marks on English.

Note: Since the average of Maths and Science was 72 marks, while the average of 3 subjects was 68 which was lower than 72, we would expect Jenny to score lower marks to bring down the average. So 60 is acceptable if no time to check. Say if you get 80 marks for English, then certainly there must be mistake. 

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