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A son's present age is \(x\) years, and his father is 28 years older than him. After 4 years, the product of their ages will be 960. What is the son's present age?

Answer and explanation

Correct answer: 16 years

The father's present age is \(x+28\) years. After 4 years, their ages will be \(x+4\) and \(x+32\) years, respectively. Thus, \((x+4)(x+32)=960\), which gives \(x^2+36x-832=0\). Its solutions are \(x=16\) and \(x=-52\). Since age cannot be negative, the son's present age is 16 years, so option C is correct. In an exam, substitute the answer back into the original condition to verify the product.

Related tags

Quadratic EquationsAge ProblemWord ProblemsApplicationsLinear And Quadratic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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