Quantitative Aptitude Time and Work Work Efficiency

A can do a work in 20 days and B can do it in 14 days. If they work together for 7 days, then the fraction of the work left is:

1
\({ {3} \over 10}\)
2
\({ {3} \over 20}\)
3
\({ {7} \over 20}\)
4
\({ {7} \over 10}\)

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