Q6 of 89 Page 120

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?

As the simplest form of the ratio is 7:4


Therefore the common factor of 7 and 4 can be taken as x.


Therefore total number of marbles is 7x+4x = 11x.


Therefore number of marbles in the box is a multiple of 11.
As 11x2 = 22


Therefore number of marbles = 22

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