Multiple choice general knowledge math & puzzles

When a student weighing 45 kgs left a class, the average weight of remaining 59 students increased by 200 g. What is the average weight of remaining 59 students?

  1. 56.8

  2. 58.2

  3. 52.2

  4. 57
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D Correct answer
Explanation

Let original average = x kg for 60 students. Total weight = 60x. When 45 kg student leaves, remaining 59 students have average (x + 0.2) kg. Their total = 59(x+0.2) = 59x + 11.8. Also, 59x + 11.8 = 60x - 45 (subtracting the student who left). Thus: 11.8 + 45 = x → x = 56.8. New average = 56.8 + 0.2 = 57 kg.

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