kritidasom kritidasom

31-08-2021
Mathematics

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The cost of 10 pencils is Rs.15 more than the cost of such 7 pencils. What is the cost of a pencil ?

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Atararaxia Atararaxia

31-08-2021

Let the cost of 7 pencils be 'x' & the cost of 10 pencils be (7x + 15)/10

According to the Question,

⇒(7x + 15)/10 = x

⇒7x + 15 = x × 10

⇒7x + 15 = 10x

⇒7x - 10x = 15

⇒3x = 15

⇒x = 15/3

⇒x = 5

∴ The cost of a pencil is ₹5

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