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If (M(t)=80+7t) and (N(t)=170-5t), when will (M(t)) be (18) more than (N(t))?

Answer and explanation

Correct answer: \(t=9\)

“18 more” means \(M(t)=N(t)+18\). Thus, \(80+7t=170-5t+18\), or \(80+7t=188-5t\). Therefore, \(12t=108\), giving \(t=9\). Option \(t=10\) may seem close, but it gives a difference of \(30\), not \(18\). Exam tip: In “more than” questions, write the larger quantity as the smaller quantity plus the stated difference.

Related tags

Linear EquationsPolynomialsLinear Growth And DecayComparison Of FunctionsAlgebraic ExpressionsIntroduction To PolynomialsMathematicsClass 9 Mcq

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