2 years ago in Time and Work

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

[A] <sup>1</sup>/<sub>4</sub>
[B] <sup>1</sup>/<sub>10</sub>
[C] <sup>7</sup>/<sub>15</sub>
[D] <sup>8</sup>/<sub>15</sub>
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