Multiple choice

The average weight of 25 candles is 40 grams. If some candles of weight 50 grams each were removed, then average weight becomes 37.5 grams. How many candles of weight 50 grams each were removed? 25 मोमबत्तियों का औसत वजन 40 ग्राम है । यदि 50 ग्राम वजन की कुछ मोमबत्तियों को हटा दिया गया, तो औसत वजन 37.5 ग्राम हो जाता है । 50 ग्राम वजन की कितनी मोमबत्तियों को हटाया गया?

  1. 3

  2. 5

  3. 8

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial total weight = 25 × 40 = 1000g. After removing n candles of 50g each, new total = 1000 - 50n and new count = 25 - n. The new average is 37.5, so (1000 - 50n)/(25 - n) = 37.5. Solving: 1000 - 50n = 937.5 - 37.5n, giving 12.5n = 62.5, so n = 5 candles.

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