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6 August, 19:48

In a set of numbers, the average of the first four is 15, and the average of the last three is 8. What is the average of all seven members?

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  1. 6 August, 21:11
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    (8+15) / 2. The answer is 12.5.
  2. 6 August, 22:12
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    15*4+8*3=60+24=84

    84:7=12

    12 is supposed to be the answer.
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