Question: Find the simple interest on Rs.500 for 9 months at 6 paisa per month?
Options:
(A) Rs.345
(B) Rs.270
(C) Rs.275
(D) Rs.324
(E) Rs.325
Ans: (B)
CoT: I = (500*9*6)/100 = 270
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Question: The inverse ratio of 4: 2: 1 is?
Options:
(A) 2:4:8
(B) 2:3:9
(C) 2:3:2
(D) 2:3:6
(E) 2:3:1
Ans: (A)
CoT: 1/4: 1/2: 1/1 = 2:4:8
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Question: Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 10 km/hr downstream and 4 km/hr upstream.
Options:
(A) 7 kmph
(B) 8 kmph
(C) 9 kmph
(D) 7 kmph
(E) 6 kmph
Ans: (A)
CoT: Speed in still water = (10 + 4)1/2 kmph = 7 kmph.
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