Question <p>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 :</p>

Option 1 <p>1/10</p>

Option 2 <p>1/4</p>

Option 3 <p>7/15</p>

Option 4 <p>8/15</p>

Correct Answer Option 1 Option 2 Option 3 Option 4