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The length of a rectangular tile is 4 cm more than its breadth, and its area is 320 square cm. What is the breadth of the tile?

Answer and explanation

Correct answer: 16 cm

Let the breadth be \(x\) cm. Then the length is \(x+4\) cm, so \(x(x+4)=320\), or \(x^2+4x-320=0\). Factoring gives \((x-16)(x+20)=0\), so \(x=16\) or \(x=-20\). Since a dimension cannot be negative, the breadth is 16 cm. Exam tip: In measurement problems, reject any negative root.

Related tags

Quadratic EquationsRectanglesWord ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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