APTITUDE MATHAMATICAL

1.If 2x-y=4 then 6x-3y=?
(a)15 (b)12 (c)18 (d)10
Ans. (b)

2.If x=y=2z and xyz=256 then what is the value of x?
(a)12 (b)8 (c)16 (d)6
Ans. (b)

3. (1/10)18 - (1/10)20 = ?
(a) 99/1020 (b) 99/10 (c) 0.9 (d) none of these
Ans. (a)

4.Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the time taken to fill the tank
(a) 17 1/7 mins (b) 20 mins (c) 8 mins (d) none of these
Ans. (a)

5. Thirty men take 20 days to complete a job working 9 hours a day.How many hour a day should 40 men work to complete the job?
(a) 8 hrs (b) 7 1/2 hrs (c) 7 hrs (d) 9 hrs
Ans. (b)

6. Find the smallest number in a GP whose sum is 38 and product 1728
(a) 12 (b) 20 (c) 8 (d) none of these
Ans. (c)

7. A boat travels 20 kms upstream in 6 hrs and 18 kms downstream in 4 hrs.Find the speed of the boat in still water and the speed of the water current?
(a) 1/2 kmph (b) 7/12 kmph (c) 5 kmph (d) none of these
Ans. (b)

8. A goat is tied to one corner of a square plot of side 12m by a rope 7m long.Find the area it can graze?
(a) 38.5 sq.m (b) 155 sq.m (c) 144 sq.m (d) 19.25 sq.m
Ans. (a)