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Solutions
From first pie-chart, we have
Total number of books sold = 7500
Books sold on Monday =
11/100 × 7500 = 825
Similarly, books sold on different days:

From second pie-chart, we have
Chemistry books sold on Monday = 16/100 × 825 = 132
Similarly, Chemistry books sold on different days:

Given that ratio between History and English books sold on Tuesday is 4 : 5.
History and English books sold on Tuesday = 540
English books sold on Tuesday = 5/9 × 540 = 300
Therefore, average of Chemistry and English books sold on Tuesday = 300+60 / 2 = 180