question:A man rows his boat 95 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Options:
(A) 10 kmph
(B) 6 kmph
(C) 5 kmph
(D) 8 kmph
(E) 7 kmph
answer:(A)
Stream of consciousness:Speed downstream = d/t = 95/(2 1/2) = 38 kmph
Speed upstream = d/t = 45/(2 1/2) = 18 kmph
The speed of the stream = (38 - 18)/2 = 10 kmph

question:what is the next no. 4 12 84
Options:
(A) 632
(B) 732
(C) 832
(D) 850
(E) 902
answer:(B)
Stream of consciousness:3^0 + 3 = 4
3^2 + 3 = 12
3^4 + 3 = 84
3^6 + 3 = 732

question:Find the wrong number below mentioned series
5,24,60,120,210,340
Options:
(A) 340
(B) 210
(C) 5
(D) 60
(E) none
answer:
(C)
Stream of consciousness:5 is the only prime number or odd number in the series.