If 9 students can make a poster in 10 hours then 5 more students should join them so that they all together can make this poster in 6 hours.
Efficiency is ability of doing a certain work.
Here given that 9 students can make a poster in 10 hours
Hence efficiency of one student is 1/90
Now we have to find number of students so that they all together can make this poster in 6 hours
Let number of students =x
Hence we can write it as
[tex]\frac{1}{6} \times\frac{1}{x} = \frac{1}{90}\\ \\6x=90\\\\x=90/6\\\\x=15[/tex]
Hence 5 more student needed.
If 9 students can make a poster in 10 hours then 5 more students should join them so that they all together can make this poster in 6 hours.
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