Multiple choice

Ten wrestlers have an average weight of 42 kg. The weights of nine wrestlers are 40, 45, 38, 44, 41, 39, 46, 43, and 40 kg. The 10th wrestler's weight is

  1. 42 kg

  2. 43 kg

  3. 44 kg

  4. 45 kg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sum of 10 weights = 42 * 10 = 420. Sum of 9 weights = 40+45+38+44+41+39+46+43+40 = 376. 10th weight = 420 - 376 = 44.

AI explanation

The total weight of all ten wrestlers is 10 times 42, which equals 420 kg. The combined weight of the nine known wrestlers is 40 plus 45 plus 38 plus 44 plus 41 plus 39 plus 46 plus 43 plus 40, totaling 376 kg. The tenth wrestler's weight is the difference between the total weight and the combined weight of the nine, which is 420 minus 376, equaling 44 kg.

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