The price of 3pens or 5pencils is Rs 15.Find the price of 3pens and 4pencils.
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3x = 15
=> x = 5
Therefore cost of 1 pen is Rs 5
5y = 15
=> y = 3
Therefore cost of 1 pencil is Rs 3
3x + 4y => 15 + 12 => 27
Therefore cost of 3 pens and 4 pencils is Rs 27
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