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A bag contains yellow, green, blue, and white marbles.  The ratio of yellow, green, blue, and white marbles is 1:2:3:4.  If the bag contains 180 marbles, then how many blue marbles are there?

 May 31, 2023
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10%, 20%, 30%, 40% = 100%

30% of 180 = 54

 May 31, 2023

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