Elitmus Exam Numerical Ability Time and Work

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

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Elitmus Other Question

in an opinion poll,78% of those asked were in favour of at least one of the three participants A,B,C.50% OF THOSE ASKED favoured A.30% favoured B.20%c.If 5% of those favoured all of the three,what percentage favoured exactly one? 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'?