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      Question

      A box contains 16 packets of rice with an average weight

      of 2.5 kg. If x new packets are added with an average weight of 3.2 kg, the new average becomes 2.8 kg. Find x.
      A 5 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 10 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer

      Solution

      ATQ, 16 * 2.5 + x * 3.2 = (16 + x) * 2.8 40 + 3.2x = (16 + x) * 2.8 3.2x – 2.8x = 44.8 – 40 0.4x = 4.8 x = 12

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