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Question Mala went to a book exhibition and bought 18 books. The shop was selling 3 books for ₹ 150. After buying the books, she still had ₹ 20 left. How much money did Mala have at the beginning?
The number of books bought by the Mala = 18
Since, the cost of 3 books is ₹ 150.
Therefore, ₹ 50 + ₹ 50 + ₹50
1 book 1 book 1 book
So, the cost of 1 book = ₹ 50
Therefore, the total cost of 18 books
= 18 × 50 = 20 × 50 – 100 ,
= 1000 – 100 = 900
So, the cost of 18 books = ₹ 900
Since, Mala still had ₹ 20 left.
Therefore, Mala had ₹ 920 (₹ 900 + ₹ 20) at the beginning.