Question 1174114
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It is good arithmetic problem to be solved by 3rd - 4th grade student ARITHMETICALLY  without using any equations.


<pre>
    Kevin stuffs  1500/4 = 375  shrimps per hour, working alone.


    With her sister, they stuff  1500/3 = 500  shrimps per hour.


    Hence, the sister stuffs  500-375 = 125  shrimps per hour, working alone.


    It means that the sister needs  750/125 = 6 hour to make this job alone.
</pre>

Solved.