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A man could buy a certain number of notebooks for Tk. 300. If each notebook cost is Tk. 5 more, he could have bought 10 notebook less for the same amount .Find the price of each notebook ?

A man could buy a certain number of notebooks for Tk. 300. If each notebook cost is Tk. 5 more, he could have bought 10 notebook less for the same amount .Find the price of each notebook ? Correct Answer 10

Let, Cost of 1 Note book = x tk. ATQ, 300/x  = {300/(x + 5)} + 10 Or, (300/x) – 300/(x + 5)  =   10 Or, (300x + 1500 - 300x)/{x(x + 5)} = 10 Or, x(x + 5)10 = 1500 Or, x2 + 5x - 150 = 0 Or, (x + 15)(x - 10) = 0 Or, x≠ - 15, x = 10 ans: 10 tk

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