80 ? 860 1550 2440 3530
Options:
(A) 370
(B) 840
(C) 750
(D) 860
(E) 960
Answer and stream of consciousness: (A)
Stream of consciousness: 10^2 - 20 = 80
20^2 - 30 = 370
30^2 - 40 = 860
40^2 - 50 = 1550
50^2 - 60 = 2440
60^2 - 70 = 3530.

A pipe can fill a cistern in 18 minutes whereas the cistern when fill can be emptied by a leak in 20 minutes. When both pipes are opened, find when the cistern will be full?
Options:
(A) 17
(B) 180
(C) 70
(D) 120
(E) 12
Answer and stream of consciousness: (B)
Stream of consciousness: 1/18 - 1/20 = 1/180
180 minutes

In a school of 850 boys, 44% of Muslims, 14% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?
Options:
(A) A) 125
(B) B) 627
(C) C) 153
(D) D) 721
(E) E) 272
Answer and stream of consciousness: (E)
Stream of consciousness: 44 + 14 + 10 = 68%
100 68 = 32%
850 * 32/100 = 272

A, B, C together started a business. A invested Rs.6000 for 5 months B invested Rs.3600 for 6 months and C Rs.7500 for 3 months. If they get a total profit of Rs.12350. Find the share of A?
Options:
(A) 3002
(B) 3000
(C) 3018
(D) 4000
(E) 5000
Answer and stream of consciousness:
(E)
Stream of consciousness: 60*5:36*6:75*3
100: 72: 75
100/247 * 12350 = 5000