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Lucas has some red, green and yellow cards. 3/7 of the cards are red. The number of red cards is twice the number of green cards. What fraction of the cards are yellow?

 Sep 9, 2021
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R     +   G            +  Y   = 1     

3/7   + 1/2 (3/7)   + Y = 1     Solve for Y

 Sep 9, 2021

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