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there are 765 marbles in a in a box. there are twice as many blue marbles as green marbles. there are 3 times as many red marbles as blue marbles, how many red marbles in the box
let the no. of green marbles be x no of blue marbles = 2x no of red marbles = 3*2x = 6x total marbles = 765 so, x+2x+6x = 765 or, x = 765/9 = 85 no of red marbles = 6*85 = 510
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