Keith had 694 green, yellow and blue marbles altogether . He had 3 times as many blue marbles as yellow marbles . There were 90 fewer green than blue marbles . How many blue marbles did Keith have ?
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Answer:
336 blue marbles
x+3x+3x-90=694
7x=694-90=784
x=784/7=112 yellow marbles
3x=336 blue marbles
3x-90=246 green marbles
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