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Samu · Answer 1 · 2015-12-01T17:28:33+0000

x - blue marbles (x>0)
2x - red marbles

There are at most 36 marbles.

$x+2x \leq 36 \\ 3x \leq 36 \\ x \leq 12 \\ 2x \leq 24$

The greatest number of red marbles in the bag is 24.

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