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If (A(t)=240-11t) and (B(t)=60+4t), when will (A(t)) be (15) more than (B(t))?

Answer and explanation

Correct answer: \(t=11\)

“15 more” means \(A(t)=B(t)+15\). Thus, \(240-11t=60+4t+15\), which gives \(165=15t\) and hence \(t=11\). Therefore, option C is correct. At \(t=10\), the difference is \(30\), not 15. Exam tip: For “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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