Multiple choice general knowledge math & puzzles

M men agree to purchase a gift for Rs. D. If three men drop out how much more will each have to contribute towards the purchase of the gift??

  1. D/(M-3)

  2. MD/3

  3. M/(D-3)

  4. 3D/M(M-3)

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Original contribution per person = D/M. After 3 men drop out, M-3 men remain, each contributing D/(M-3). The extra amount = D/(M-3) - D/M. Taking LCM: = DM/M(M-3) - D(M-3)/M(M-3) = 3D/M(M-3).