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

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Solution

The correct option is C 22
The number of marbles in the box must be a whole number.
Since the given ratio is 4 : 7, the total number of marbles must be a multiple of 11(4 + 7).

11 × 2 = 22
Out the four options, only 22 is a multiple of 11. Hence, option D is correct.

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