question:What will come in place of the x in the following Number series? 2, 7, 27, 107, 427, x
Options:
(A) 1427
(B) 1607
(C) 1707
(D) 2047
(E) 2147
answer:(C)
Stream of consciousness:2
2 4 - 1 = 7
7 4 - 1 = 27
27 4 - 1 = 107
107 4 - 1 = 427
427 4 - 1 = 1707

question:Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?
Options:
(A) 299
(B) 2767
(C) 120
(D) 287
(E) 261
answer:(C)
Stream of consciousness:Work done by the waste pipe in 1 minute = 1/15 - (1/20 + 1/24) = - 1/40
Volume of 1/40 part = 3 gallonsVolume of whole = 3 * 40 = 120 gallons.

question:A light has a rating of 110 watts, it is replaced with a new light that has 30% higher wattage. How many watts does the new light have?
Options:
(A) 143
(B) 145
(C) 156
(D) 134
(E) 100
answer:
(A)
Stream of consciousness:Final number = Initial number + 30%(original number) = 110 + 30%(110) = 110 + 33 = 143.