apti Ques

1) There are 30 socks in a bag.
   Out of these 60 % are green and the rest are blue.
   What is the maximum number of times that socks have to be taken out so that at least 1 blue pair is found.
(a) 21     (b) 2    (c)18      (d) 20
Ans. D
2) You have Rs 1000 with 8% p.a compounded every 6 months. What is the total interest you get after 1 year.
(a) Rs.116.40    (b) Rs.345.60    (c) Rs.224.50   (d) Rs.160 
Ans. A
3) With one gallon of petrol a person moves at a speed of 50 mph and covers 16 miles.
     3/4th of the distance is covered while moving at 60 mph.
     How many gallons does he need to cover 120 miles in 60 mph.
ans. With one gallon of petrol a person moves at a speed of 50 mph and covers 16 miles.
While moving at 60 mph. the distance is covered = 3/4thof 16miles= 12miles
Gallons needed to cover 120 miles at 60 mph.= 120/12 = 10 gallons
4)Find the lowest of the three numbers in a GP whose sum is 38 and product 945.
(a) 12    (b) 18     (c) 4    (d) 8
Ans. D
    can use for gp a/r, a, ar
5) Two pipes A and B can fill a tank in 20 and 25 seconds respectively. Both are opened at the same time and after 5 minutes the first one is closed. How much more time will it take for the tank to be full?
(a) 13 min 45 secs    (b) 10 min (c) 18 min   (d) 15 min 45 secs
Ans. A
Pipe A can fill the tank in 20 minutes

let x be the capacity of tank


20------------x
1-------------x/20
5 minutes-------x/4

pipe B

5 minutes--------x/5

total after 5 minutes = x/4+x/5= 9x/20

so 11x/20 is left to be filled by second pipe

x-------25
1-------25/x
11x/20------25/x*11x/20

and the answer is 13 minutes 45 second