Teaching PSTET Paper 1 & 2 Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency

A can do a piece of work in 20 days and B in 25 days. If they work together on it for 5 days, then the fraction of the remaining work is ____.

1
\(\frac{11}{20}\)
2
\( \frac{21}{28}\)
3
\(\frac{21}{25}\)
4
\(\frac{21}{29}\)
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