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In a class, the total number of boys and girls is (45). Boys are (9) more than girls. What is the number of boys?

Answer and explanation

Correct answer: 27

Let the number of boys be \(x\) and the number of girls be \(y\). Then \(x+y=45\) and \(x-y=9\). Adding the two equations gives \(2x=54\), so \(x=27\). Therefore, the number of boys is 27. Option 26 is close, but it would leave 19 girls, giving a difference of 7 rather than 9. Exam tip: for questions giving a total and a difference, add the equations to find the larger quantity directly.

Related tags

Pair Of Linear EquationsWord ProblemsSubstitution MethodElimination MethodClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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