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      Question

      The average weight of 28 students in a class is 40 kg

      while the average weight of 5 teachers who teach them is 58 kg. 10 students and 1 teacher go for a trip, and the average weight of the remaining students and teachers is 42 kg and 60 kg respectively. What is the average weight of the group that went on the trip?
      A 25.44 kg Correct Answer Incorrect Answer
      B 66.22 kg Correct Answer Incorrect Answer
      C 37.64 kg Correct Answer Incorrect Answer
      D 29.22 kg Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      10 students and 1 teacher went for the trip which means 18 students and 4 teachers did not go to the trip.

      Total weight of 10 students who went for the trip = 40 ├Ч 28 тАУ 42 ├Ч 18 = 1120 тАУ 756 = 364 kg

      Total weight of 1 teacher who went for the trip = 58 ├Ч 5 тАУ 60 ├Ч 4 = 290 тАУ 240 = 50 kg

      Total weight of all the people who went for the trip = 364 + 50 = 414 kg

      Required average = 414 / 11 = 37.64 kg

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