Question 735844: if there are 120 red paper clips and 2/3 of the paper clips are red, how many green paper clips are there?
Found 2 solutions by lynnlo, ikleyn:
Answer by lynnlo(4176)   (Show Source):
Answer by ikleyn(53339)  (Show Source):
You can put this solution on YOUR website! .
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.
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.
ANSWER. The number of green paper clips is 60.
Solved.
The answer " 80 " in the post by @lynnlo is wrong : so, ignore it.
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