Question 859761
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Hi,
let x represent number of blue  &#8658; x/2 yellow and 3x/2 red
 x + x/2 + 3x/2 = 84
 2x + x + 3x = 168
        6x = 168
         x = 28, number of blue. 14 yellow and 42 red
CHECKING our answer***
 28 + 14 + 42 = 84
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