Quantitative Aptitude Time and Work Work Efficiency

A can complete a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of work that is left will be ______.

1
4
2
\(\frac{1}{4}\)
3
\(\frac{15}{8}\)
4
\(\frac{8}{15}\)

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