In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there?  Select:
A) 100
B) 150
C) 50
D) 250
E) 75
Let the number of 25 p, 10 p and 5 p coins be x, 2x, 3x respectively.   Then, sum of their values = Rs. ((25x/100) + (10 x 2x/100)+(5 x 3x)/100= Rs. 60x/100   Therefore, 60x/100 = 30   x = 30 x 100/60 = 50.   Hence, the number of 5 p coins = (3 x 50) = 150.   Answer is 150.
<result>B</result>
In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there?