If 2 : 9 :: x : 18, then find the value of x
Pick
A) 2
B) 3
C) 4
D) 5
E) 6
Explanation:   Treat 2:9 as 2/9 and x:18 as x/18, treat :: as =   So we get 2/9 = x/18   =&gt; 9x = 36   =&gt; x = 4   Option 4
<result>C</result>
If 2 : 9 :: x : 18, then find the value of x