If the average (arithmetic mean) of 2x, 4x, and 8x is 140, what is the value of x? Choose the correct answer: A) 20 B) 30 C) 15 D) 33 E) 31
AM of 2x, 4x and 8x = 2x + 4x + 8x / 3 = 14x/3   Given that 14x/3 = 140   x = 30   Answer is 30
<result>B</result>
If the average (arithmetic mean) of 2x, 4x, and 8x is 140, what is the value of x?