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For which positive number will multiplying the number obtained by adding 6 to it by the original number give 135?

Answer and explanation

Correct answer: 9

Let the positive number be \(x\). The statement gives \(x(x+6)=135\), so \(x^2+6x-135=0\). Factoring, \((x-9)(x+15)=0\), gives \(x=9\) or \(x=-15\). Since the number must be positive, the valid answer is \(9\). Check: \(9\times(9+6)=9\times15=135\). Exam tip: Translate the wording into an equation such as \(x(x+6)\) first, then apply the condition that the required number is positive.

Related tags

Quadratic EquationsWord ProblemsFactorisationPositive IntegersWord Problems And ApplicationsMathematicsClass 10 Mcq

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