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P,Q and R work together to complete a piece of work in x days. P and R take 20 days and 30 days respectively to complete the work. Q is faster than R and slower than P. If x is an integer, then how many values can it take ?

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Solution : (i) FIND the range of the work DONE by all the three in one day, working TOGETHER.
(II) Find the work done by P and R in x days.
(iii) Remainingwork is completed by Q in x days.
(iv) Use the above information and find the DISTINCT values for x.


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