30 pens and 75 pencils altogether were purchased for ₹510.

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30 pens and 75 pencils altogether were purchased for ₹510. If the average price of a pencil was ₹2, what was the average price of a pen ?

Let average cost of 1 pen = ₹y, then
From question ,
30y + 75 × 2 = 510
⇒ 30y = 510 – 150 = 360
⇒ y = 360 ÷ 30 = 12