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# The ratio of blue marbles to redmarbles in a bag is 11:9. If there are 99 blue marbles, in the bag, how many red marblesare there?

$Radio:11:9\\ 11--99\\ \ 9--x\\ x=\frac{9}{11}*99=81$
$ratio=11:9$ $11:9=99:x$ $11x=891$ $\frac{11x}{11}=\frac{891}{11}$ $x=81$ There are eighty-one marbles.