Question 735844
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if there are 120 red paper clips and 2/3 of the paper clips are red, how many green paper clips are there?
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        This problem is of the level of a  5th or  6th grade - not higher.

        Let solve it mentally,  based on common sense and reasoning.



<pre>
From the context, there are only two types of paper clips in this problem : red and green.


The number of red paper clips is 120, and this comprises 2/3 of all paper clips in the problem.


Hence, the green paper clips are 1/3 of all paper clips.


But if 2/3 of all paper clips is 120, then 1/3 of all paper clips is half of 120, i.e. 120 : 2 = 60.


Thus the number of green paper clip is 60.


<U>ANSWER</U>.  The number of green paper clips is 60.
</pre>

Solved.


The answer &nbsp;" 80 "  &nbsp;in the post by &nbsp;@lynnlo is wrong : &nbsp;so, &nbsp;ignore it.