Question
A is twice as efficient as B at completing a task, and
together they can finish the task in 20 days. How many days would A alone take to complete the task?Solution
A is twice as efficient as B, and together they can complete a task in 20 days.  Let B's work rate be x.  A's work rate is 2x.  Combined work rate of A and B: 2x + x = 3x.  Together they complete the task in 20 days: 3x = 20   x = 1 /60  A's work rate is 2x=2× 1 /60 =1 /30 =30days
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