SSC Maths Imp question
A man ordered 10 physics books and some chemistry books, The price of a chemistry book is twice the price of a Physics book. While preparing the bill, the clerk interchanged the number of physics and chemistry books by mistake, which decreased the bill by 12 1⁄2%. The ratio of the number of physics books to the number of chemistry books in the original order is
1)3:5
2)3:4
3)4:5
4)2:3
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