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      Question

      If A varies directly as B and inversely as C and A = 10,

      B = 5 and C = 7, what is the value of A when B = 8 and C = 7?
      A 20 Correct Answer Incorrect Answer
      B 35 Correct Answer Incorrect Answer
      C 16 Correct Answer Incorrect Answer
      D 10 Correct Answer Incorrect Answer

      Solution

      Let the constant be x, According to the question, => A = x × B/C => 10 = x × 5/7 => x = 14 Now putting the value of A, => A = 14 × (8/7) => A = 16

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