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The product of two positive numbers is 560, and the larger number is 14 more than the smaller number. What is the smaller number?

Answer and explanation

Correct answer: 16

Let the smaller number be \(x\). Then the larger number is \(x+14\), so \(x(x+14)=560\). Thus, \(x^2+14x-560=0\), which factors as \((x-16)(x+30)=0\). Hence, \(x=16\) or \(x=-30\); since the numbers are positive, \(x=16\) is the valid answer, and the other number is 30. Option 20 is incorrect because \(20\times34=680\). Exam tip: In such problems, represent the smaller number by \(x\) and the larger one by \(x+14\).

Related tags

Quadratic EquationsWord ProblemsPositive IntegersProduct Of NumbersFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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