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Question
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?
Options
18
19
21
22
Solution
22
Explanation:
Given, The ratio of red marbles to blue marbles = 7:4
Let the number of red marbles = 7x
And blue marbles = 4x
Then, total number of marbles = 7x + 4x = 11x
Total number of marbles must be multiple of 11.
By observation,
⇒ 11x = 11 × 2
∴ 11x = 22
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