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

1. $ABCD \sim JKLM$     

   Hint (a):

   If each pair of shapes is similar, then

   $\frac{6}{12} = \frac{10}{x} \text{ and }\frac{39}{w} = \frac{3}{7}.$

   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. $∆NOP \sim ∆XYZ$     

   Answer (b):

   $w = 91$