Answer: 24
Step-by-step explanation:
You need to find the common denominator. In the case 24 is the least one because when you multiply 3 by 8, you finally have a common denominator for all three.
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If we rearrange the given data set from lowest to highest, we have

The minimum is 3.
The first quartile is the average of 6 and 7, which is 6.5
The median is the average of 8 and 10 which is 9.
The third quartile is the average of 12 and 15 which is 13.5.
The maximum is 18.
x = 5.25
since there is a scale factor of 1.75, you multiply 3 * 1.75 and get 5.25
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