Elitmus Exam Logical Reasoning Decision Making and Problem Solving

There are 'n' temples and each temple is having 'one' pond infront of it?
At first we are having 'x' flowers,before entering in to the temple
we have to be immersed in pond, if we immersed the count of flowers
will be doubled, at each of the temple we should keep 'y' flowers and
we should move to next temple?
At last you should come out with zero flowers at the end of all temples.
Find the x(number of flowers you take at first) and
y(number of flowers you will keep in temple)?

Hint: Answers will be in terms of 'n'?

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Elitmus Other Question

Amit can complete a piece of work in 2.25 days.badri takes double the time taken by amit.chetan takes double dat of badro,and das takes double dat of chetan to complete the same task.They are split into two groups(of one or more persons)such that the differnce b/w the times taken by the two groups to complete the same work is minimum.what could be the compostion of the faster group?
a)amit and das
b)badri nd chetan
c)badri,chetan nd das
d)amit alone
when a certain number'x' is multiplied by 18, the product 'y' has all digit as 4s. what is the minimum number of digits 'x' can have?