cookies are sold singly or in packages of
66
or
1818.
with this packaging, how many ways can you buy
3636
cookies

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

she will travel a distance in the range of 3 - 11 miles