Cost of 5 books = ₹15 . Find the cost of 7 books?
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Step-by-step explanation:
Cost of 5 books = 15
cost of 1 book = 15÷5 = 3
cost of 7 books = 7×3 = 21 rupees
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1
Cost of 5 books = 15 Rs /-
Cost of 1 book = 3 Rs /-
Books left = 7 - 5
= 3 books
Cost of 3 books = 3 × 3
= 9 Rs /-
Cost of 7 books = 15 + 7
= 21 Rs /-
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