If p men, working p hours per day, can do p units of work in p days, then q men, working q hoyrs per day would be able to complete how many units of work in q days ?
Solution: Let the required number of units of work be x.
More men, more work (DP)
more working hours, more work (DP)
more days, more work (DP)
men p : q
hours per day p : q } : : p : x
days p : q
.'. (p*p*p*x) = (q*q*q*p)
=> x = q^3/p^2.
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