The cost of 4 pens and 4 pencil boxes is Rs 100. Three times the cost of a pen is Rs 15 more than the cost of a pencil box. From the pair of linear equations for the above situation. Find the cost of a pen and a pencil box?

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Dheerendra Singh

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A pen box is at 15 cost price and a pencil box is at 10 c.p.
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10, 15
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Given , 4 Pens + 4 Pencil box = 100 3 Pens = Pencil box + 15 On solving , Pen = 10 Pencil box = 15
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