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Which positive number has a product of 330 with the number obtained by adding 7 to it?

Answer and explanation

Correct answer: 15

Let the positive number be \(x\). Then \(x(x+7)=330\), so \(x^2+7x-330=0\). Factoring gives \((x-15)(x+22)=0\), yielding \(x=15\) or \(x=-22\). Since the number must be positive, \(x=15\) is correct. Exam tip: verify the answer using \(15\times(15+7)=15\times22=330\).

Related tags

Quadratic EquationsWord ProblemsNumber ProblemsFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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