Solve for the missing lengths in the sets of similar figures below. You may want to set up tables to help you write equations.  

1. $ABCD\sim JKLM$ 

   vertex$A$	top edge$12 \text{ mm}$	vertex$B$
   left edge$6 \text{ mm}$	interior rectangle $\space$
   vertex$D$		vertex$C$

   vertex$J$	top edge$x$	vertex$K$
   left edge$10 \text{ mm}$	interior rectangle $\space$
   vertex$M$		vertex$L$

   Hint (a):

   If each pair of shapes is similar, then $\frac{6}{12}=\frac{10}{x}$ and $\frac{39}{w}=\frac{3}{7}$.

   More Help (a):

   Start to solve for each variable by multiplying both sides of the equation by the lowest common denominator.

   Reminder (a):

   Check your answers!

2. $ΔNOP\sim∆XYZ$ 

   

   Answer (b):

   $w=91$