$A$ and $B$ can together finish a work in $30$ days. They worked together for $20$ days and then $B$ left. After another $20$ days, $A$ finished the remaining work. In how many days $A$ alone can finish the job?

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If 20 men working together can finish a job in 20 days, find the number of days taken by 25 men of the same capacity to finish the job.

The correct option is C 16Using Work=men×days we getWork=20×20Work=400Now, work is same and number of days are to be calculated 400=25×daysdays=16Therefore, the answer is (C).

If $20$ men working together can finish a job in $20$ days, find the number of days taken by $25$ men of the same capacity to finish the job.

The correct option is C $16$
Using $W o r k = m e n \times d a y s$ we get
$W o r k = 20 \times 20$
$W o r k = 400$

Now, work is same and number of days are to be calculated
$400 = 25 \times d a y s$
$d a y s = 16$
Therefore, the answer is $(C)$ .