If x=y=2z and xyz=256 then what is the value of x?
Ans.
8
Q.3
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?
Ans.
7 1/2 hrs
Q.4
Find the smallest number in a GP whose sum is 38
and product 1728
Ans.
8
Q.5
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
Ans.
7/12 kmph
Q.6
The average age of 10 members of a committee is
the same as it was
4 years ago, because an old member has been replaced
by a young
member. Find how much younger is the new member ?
Ans.
40 years.
Q.7
Three cards are drawn at random from an ordinary
pack of cards.
Find the probability that they will consist of a king,
a queen and an ace.