In a library there are 990 books if the number of English book is four times the number of Mathematics book and the number of mathematics books is twice the number of science books find the number of book of each subject
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Total number of books = 990
Let the number of Science books = x
Then the number of Mathematics books = 2x
Number of English books = 4*2x = 8x
Total number of books = x + 2x + 8x = 11x = 990
x = 990/11 = 90
So, number of Science books = x = 90
Number of Mathematics books = 2x = 2*90 = 180
Number of English books = 8x = 8*90 = 720
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Answer:
no. of science book=90
no. of english book=2*90
no. of maths book=720
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