In a bag there are coins of 50 paisa, 25 paisa and one rupee in the proportion 10:8:2. If there are in all Rs.90, the number of 50 paisa coins is? Choose the correct choice.
A) 120  B) 110  C) 90  D) 80  E) 100
10x 8x 2x   50 25 100   500x + 200x + 200x = 4200   900x = 9000   x = 10 =&gt; 10x = 100   Answer: 100
<result>E</result>
In a bag there are coins of 50 paisa, 25 paisa and one rupee in the proportion 10:8:2. If there are in all Rs.90, the number of 50 paisa coins is?