A list of measurements in increasing order is 4, 5, 6, 8, 15 and x. If the median of these measurements is 3/4 times their arithmetic mean, what is the value of x?  Options:
A) 16	B) 18	C) 20	D) 22	E) 24
The median is (6+8)/2= 
<gadget id="calculator">(6+8)/2</gadget>
<output>7</output>
7   The mean is (4+5+6+8+15+x)/6= (38+x)/6   (38+x) /6 * 3/4 = 7   x = 56-38= 
<gadget id="calculator">56-38</gadget>
<output>18</output>
18   The answer is 18.
<result>B</result>
A list of measurements in increasing order is 4, 5, 6, 8, 15 and x. If the median of these measurements is 3/4 times their arithmetic mean, what is the value of x?