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The product of the numbers that are 6 and 13 more than a number is 1394. What is the original number?

Answer and explanation

Correct answer: 28

Let the original number be (x). Then (x+6)(x+13)=1394. On expanding, (x^2+19x-1394=0, which factors as (x+47)(x-28)=0. Thus (x=28 or x=-47). Among the given options, the correct answer is 28. The negative root (-47 also satisfies the equation, but it is not listed. Exam tip: In word problems, represent the unknown by (x), translate each condition algebraically, and then form the quadratic equation.

Related tags

Quadratic EquationsWord ProblemsFactorisationNumber ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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