Simple interest = (18000 * 3 * 15)/100 = Rs. 8100
Amount = P + I = 18000 + 8100 = Rs. 26100
What amount does Kiran get if he invests Rs. 18000 at 15% p.a. simple interest for three years?
Options:
(A) 29893
(B) 27773
(C) 29989
(D) 26100
(E) 29883
(D)

1/8 + 1/12 - 1/15 = 17/120
120/17 = 7 1/17
Two pipes A and B can fill a cistern in 8 and 12 minutes respectively, and a third pipe C can empty it in 15 minutes. How long will it take to fill the cistern if all the three are opened at the same time?
Options:
(A) 17 1/17 min
(B) 28 1/7 min
(C) 17 1/7 min
(D) 17 1/8 min
(E) 17 5/7 min
(A)

Since average price of a pencil = 2
Price of 75 pencils = 150
Price of 30 pens = (450 150) = 300
Average price of a pen = 36060 = 10
30 pens and 75 pencils were purchased for 450. If the average price of a pencil was 2.00, find the average price of a pen.
Options:
(A) 10
(B) 11
(C) 12
(D) 13
(E) 14
(A)