Question:
The table below shows the number of books read by each pupil in a class of 30 pupils. One of the numbers in the table is covered by an ink blot.
The average number of books read by the pupils in the class is y.
(a) Find the total number of books read by the class.
(b) What is the number covered by the ink blot?
Leave your answer in terms of y for (a) and (b).
Solution:
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