Monday, April 5, 2010

Average P6 2009 SA1 P2 RGS Q7

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.

No comments:

Post a Comment