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Form the pair of linear equations in the...

Form the pair of linear equations in the following problems and find their solutions (if they exist) by the elimination method:
A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Saritha paid Rs. 27 for a book kept for seven days, while Susy paid Rs. 21 for the book she kept for five days. Find the fixed charge and the charge for each extra day.

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The correct Answer is:
Rs. 15 and Rs. 3
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