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The product of a positive number and the number that is 3 greater than it is 180. What is the smaller number?

Answer and explanation

Correct answer: 12

Let the smaller number be \(x\). The other number is \(x+3\), so \(x(x+3)=180\), or \(x^2+3x-180=0\). Factoring gives \((x-12)(x+15)=0\), so \(x=12\) or \(x=-15\). Since the number is positive, \(x=12\) is the valid answer. Check: \(12\times15=180\). Exam tip: In such word problems, represent the smaller number by \(x\) and express the other using the given difference, here \(x+3\).

Related tags

Quadratic EquationsWord ProblemsNumber ProductsFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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