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4 years ago, because an old member has been replaced
by a young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.