Question
The ratio between the number of books and pencils is 7:5
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 : 5x Cost = books: pencil = 3y : 2y Total cost = books: Pencil = 21xy : 10xy Required % = [(21xy-10xy)/10xy] × 100 = 110%
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