If 3 : 7 :: x : 21, then find the value of x
Choose the correct option
A) 7
B) 8
C) 11
D) 6
E) 9
9xplanation:
Treat 3:7 as 3/7 and x:21 as x/21, treat :: as = So we get 3/7 = x/21
=&gt; 7x = 63
=&gt; x = 9 Option 9
<result>E</result>
If 3 : 7 :: x : 21, then find the value of x