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3 February, 09:19

A bag contains 144 marbles. Some are red and the rest are black. There are 11 red marbles for every black marble. How many red marbles are in the bag?

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  1. 3 February, 12:53
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    There are 132 red marbles and 12 black marbles

    Work:

    I made a ratio of 11:1 and multiplied both sides by 12 which gave me 132:12

    132+12=144
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