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The denominator of a fraction is 4 more than its numerator. If 2 is added to both the numerator and denominator, the fraction becomes \(\frac{3}{5}\). What is the original numerator?

Answer and explanation

Correct answer: 4

Let the original numerator be \(x\). Then the denominator is \(x+4\). According to the condition, \(\frac{x+2}{x+6}=\frac{3}{5}\). Cross-multiplication gives \(5x+10=3x+18\), so \(2x=8\) and \(x=4\). Check: the original fraction is \(\frac{4}{8}\), and adding 2 to both terms gives \(\frac{6}{10}=\frac{3}{5}\). Exam tip: in such problems, represent the numerator by \(x\) and express the denominator using the stated difference.

Related tags

Quadratic EquationsFraction Word ProblemAlgebraic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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