Question
The ratio between the number of books and pencils is 7:6
and the ratio of cost of per book and pencil is 3:2 then find the percentage by which total cost of book is greater than the total cost of pencil.Solution
Number = books: Pencil = 7x : 6x Cost = books: pencil = 3y : 2y Total cost = books: Pencil = 21xy : 12xy Required % = [(21xy-12xy)/12xy] × 100 = 75%
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2040, 600, 240, 150, ?, 121.875
Average number of pages in 54 books is 240. Two more books with pages (b + 20) and (b - 8) are added, and the average becomes 242. Find (b - 100).
