7. The average marks received by Jane, Alice, Susan and Mabel in a recent Science test was 76 marks. Jane and Alice got 8y marks each while Susan got half of Mabel’s marks. How many marks did Susan score for the test? Express your answer in terms of y. [3]
76 x 4 = 304
3 u -- > 304 – 8y - 8y = 304 – 16y
1 u -- > (304 – 16y)/3
Susan scored (304 – 16y)/3 marks.
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