Multiple choice general knowledge math & puzzles

If 20kg of rice cost Rs.200 less than 80 kgs of wheat. If a kg mixture of rice and wheat is in the proportion 2:3 and cost Rs.15, Find per kg cost of rice in Rs.

  1. 15

  2. 20

  3. 10

  4. None of these.

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

Let R and W be costs per kg. 20R = 80W - 200, so R = 4W - 10. Mixture cost: (2R + 3W)/5 = 15, so 2R + 3W = 75. Substituting R: 2(4W - 10) + 3W = 75 => 11W = 95 => W = 8.63. Then R = 24.54. None of the provided numerical options match.