Solve for the missing lengths in the sets of similar figures below.  

1. $ΔABC\simΔOPQ$

   

   

   Answer (a):

   $\frac{6}{f} = \frac{4}{6}$

   $f=9$

2. $EFGHI\sim STUVW$

   

   

   Hint (b):

   $\frac{24}{20} = \frac{g}{15}$

3. $JKLM ∼ WXYZ$

   

   

   Hint (c):

   Use the same method you used to solve parts (a) and (b).