Quantitative Aptitude :: Decimal Fraction - Discussion

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Explanation:
Given computer cluster open for public = 5
So, Total laptops = 33 * 5 = 165
In the first week used 75 means 75 out of \(165 = \frac{75}{165} = \frac{15}{33}\)
2nd week \(\frac{155}{165} = \frac{31}{33}\)
3rd week \(\frac{30}{165} = \frac{6}{33}\)
4th week \(\frac{160}{165} = \frac{32}{33}\)
So. Total no of laptops used = \(\frac{\left(15+6+31+32\right)}{33} = 88\)
The fraction of library computer is in used = \(\frac{88}{33} \times \frac{1}{4} = \frac{2}{3}\)