Answer page  for  "Honey I Shrunk the Kids".
Facts        12 inches = 1 foot
                  5280 feet = 1 mile

Calculation            Find the scale factor first.
                               Nick says    64 feet is equivalent to 3.2 miles
                                                    64 feet is equivalent to 3.2 x 5280 feet
                                                       1 foot is equivalent to 3.2 x 5280 / 64 feet
                                                       1 is equivalent to 264
                                Scale factor is 1 : 264

Question 1    Nick is 1/4 inches tall
                       Nick is 1/4 x 264 inches
                       Nick is 1/4 x 264 / 12 feet tall
                       Nick is 5.5 feet

Question 2   Butterfly has a wingspan of 42 feet
                      42 feet is equivalent to 42 / 264 feet
                      42 feet is equivalent to 42 x 12 / 264 inches
                      42 feet is equivalent to 1.909 inches
                      42 feet is equivalent to  1.91 (dp) inches
                Is this about right for the wingspan of a butterfly?
                If it is the Nick's calculation is correct.

Question 3   Honey, I Shrunk the Kids!