In a school library 50% of total books are of mathematics. 70% of the no. of mathematics books are of science. 20% of the number of science books are English books. If the number of English books are 490. What is the total number of books in lthe ibrary?10000800070005000
Question
In a school library 50% of total books are of mathematics. 70% of the no. of mathematics books are of science. 20% of the number of science books are English books. If the number of English books are 490. What is the total number of books in lthe ibrary?10000800070005000
Solution
The problem can be solved by working backwards from the given information.
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We know that 20% of the science books are English books, and there are 490 English books. So, the total number of science books is 490 / 20% = 2450 books.
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Next, we know that 70% of the mathematics books are science books. So, the total number of mathematics books is 2450 / 70% = 3500 books.
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Finally, we know that 50% of the total books are mathematics books. So, the total number of books in the library is 3500 / 50% = 7000 books.
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