If the range of the set of numbers {140, 90, 135, 110, 170, 145, x, 100, 140} is 100, which of the following could be x? Choose the correct choice from the following answers.
A) 170
B) 190
C) 210
D) 230
E) 250
The range of the other 8 numbers is 170-90= 
<gadget id="calculator">170-90</gadget>
<output>80</output>
80, so x must be either the smallest number or the largest number in the set.   Then x= 170-100= 
<gadget id="calculator">170-100</gadget>
<output>70</output>
70 or x= 90+100= 
<gadget id="calculator">90+100</gadget>
<output>190</output>
190   The answer is 190.
<result>B</result>
If the range of the set of numbers {140, 90, 135, 110, 170, 145, x, 100, 140} is 100, which of the following could be x?