Explanation
Khilona earned scores of 97, 73 and 88 respectively in her first three examinations. If she scored 80 in the fourth examination, then her average score will be
Step -1: Finding number of work units for the first case.
Total 24 men work for 8 hours a day and takes a total of 15 days to complete it.
So total work units=24×8×15=2880
Thus, for the first case, it's a total of 2880 work units.
Step -2: Finding number of days for the second case.
Let it takes x days for the worker to complete the task, so we can write
Number of work units=20×9×x=180x
Also, the work is same so the work units must be same
So, equating the work units for the two cases, we get
⇒2880=180x
⇒x=2880180=16
Thus, it will take 16 days for the 20 workers to complete the work. Thus, option B is correct.
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