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A photograph has an outer length of 12 cm and breadth of 8 cm. A frame of uniform width is fitted around it, leaving an inner photograph area of 60 cm². What is the width of the frame?

Answer and explanation

Correct answer: 1 cm

Let the uniform frame width be \(x\) cm. Then the inner length is \((12-2x)\) cm and the inner breadth is \((8-2x)\) cm. Thus, \((12-2x)(8-2x)=60\), which gives \(x^2-10x+9=0\), so \(x=1\) or \(x=9\). The value \(x=9\) cm is impossible because it exceeds the outer breadth of 8 cm. Therefore, the frame width is 1 cm. Exam tip: When a border is present on both sides, subtract \(2x\) from each outer dimension.

Related tags

Quadratic EquationsWord ProblemsArea And PerimeterFrame ProblemsAlgebraic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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