If 2/w + 2/x = 2/y and wx = y, then the average (arithmetic mean) of w and x is Choose the correct choice:
A) 1/2
B) 1
C) 2
D) 4
E) 8
Given: 2/w + 2/x = 2/ywx=y   Find: (w+x)/2 = ?   2(1/w + 1/x) = 2(1/y) - divide both sides by 2   (1/w + 1/x) = 1/y   (x+w)/wx = 1/wx - sub'd in y=wx   x+w - 1 = 0   x+w = 1   Therefore (w+x)/2 = 1/2   1/2ns: 1/2
<result>A</result>
If 2/w + 2/x = 2/y and wx = y, then the average (arithmetic mean) of w and x is