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?
(A) 18
(B) 19
(C) 21
(D) 22
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Answer:
The total number of marbles in the box could be multiple of
7+4 = 11
that can be 11,22,33,44....
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