In a box, the ratio of the number of red marbles to that of blue marbles is $4 : 7$ . which of the following could be the total number of marble in the box?

14

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21

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22

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28

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Solution

The correct option is C: $22$
With ratios, add all the parts together to get a total.
In this case,it is $4$ red and $7$ blue.
Total $= 7 + 4 = 11.$
Therefore, the lowest total number of marbles is $11$ .The answer will be any number divisible by $11$ .
Hence it is $22.$

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