Luis ordered four pairs of black socks and some additional pairs of blue socks from a clothing

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Luis ordered four pairs of black socks and some additional pairs of blue socks from a clothing catalogue. The price of the black socks per pair was twice that of the blue. When the order was filled, it was found that the number of pairs of the two colours had been interchanged. This increased the bill by 50% (before taxes and delivery charges). Find the ratio of the number of pairs of black socks to the number of pairs of blue socks in Luis’s original order.
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Contemporary Business Mathematics with Canadian Applications

ISBN: 978-0133052312

10th edition

Authors: S. A. Hummelbrunner, Kelly Halliday, K. Suzanne Coombs

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