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A rectangular page has an area of \(300\,\text{cm}^2\), and its length is \(5\,\text{cm}\) more than its breadth. What is the breadth of the page?

Answer and explanation

Correct answer: 15 cm

Let the breadth be \(x\) cm. Then the length is \((x+5)\) cm. Using the area, \(x(x+5)=300\), so \(x^2+5x-300=0\). Factoring gives \((x-15)(x+20)=0\), hence \(x=15\) or \(x=-20\). Since a length cannot be negative, the breadth is \(15\) cm. In such word problems, always reject the negative root as physically meaningless.

Related tags

Quadratic EquationsWord ProblemsArea Of RectangleFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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