Rationale: This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.
The answer: (A)
Question: Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
Options:
(A) 10
(B) 12
(C) 7
(D) 8
(E) 9
Reasoning: 1 minute's work of both the punctures = (19 + 16) = 518
So, both the punctures will make the tyre flat in 185 = 335 min.
Ans: (C)
Question: A tyre has two punctures. The first puncture along would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?
Options:
(A) 1 12 minutes
(B) 3 12 minutes
(C) 3 35 minutes
(D) 4 14 minutes
(E) None of these
Rationale: Dolphin once in 3 min;
Beluga once in 6 min;
So, dolphin comes up 2 times frequently than beluga, which is 150% (6-3)/2*100.
The answer: (E)
Question: On average, the bottle-nosed dolphin comes up for air once every three minutes; the beluga whale, a close relative, comes up for air on average once every six minutes. The number of times a bottle-nosed dolphin would come up for air in a 24 hour period is approximately what percent greater than the number of times a beluga whale would come up for air in that same period?
Options:
(A) 25%
(B) 50%
(C) 75%
(D) 100%
(E) 150%
Reasoning: 1-1/4 = remain cake 3/4
3/4*3 = 9/4
9/4+1/4 = 10
Ans: (C)
Question: In a family, the father took 1/4 of the cake and he had 3 times as much as each of the other members had. The total number of family members is
Options:
(A) 3
(B) 7
(C) 10
(D) 12
(E) 15
Rationale: You have 40 multiples of 5, 8 of 25 and 1 of 125. This will give 49 zeros.
The answer: (C)
Question: How many terminating zeroes R does 200! have?
Options:
(A) 40
(B) 48
(C) 49
(D) 55
(E) 64
Rationale: 16 m/s = 16 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 16 * 18/5 * 15/4 km = 216 km.
The answer: (E)
Question: If a man can cover 16 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Options:
(A) 180km
(B) 190km
(C) 200km
(D) 210km
(E) 216km