In a bag there are coins of 50 paisa, 25 paisa and one rupee in the proportion 2:3:5. If there are in all Rs.40.50, the number of 50 paisa coins is?
Options:  A) 18  B) 16  C) 12  D) 24  E) 36
2x 3x 5x   50 25 100   100x + 75x + 500x = 4050   675x = 4050   x = 6 =&gt; 2x = 12   Answer: 12
<result>C</result>
In a bag there are coins of 50 paisa, 25 paisa and one rupee in the proportion 2:3:5. If there are in all Rs.40.50, the number of 50 paisa coins is?