Answer:
There are 12 colors available
Explanation:
We have product rule which states that if there are
ways of doing one task, and
ways of doing another task then there
ways of doing the tasks together.
Let us assume that there are x choices for colors
so we have 4 ways of selecting engines , 2 ways of selecting transmissions and x ways of selecting colors
number of ways of truck could be equipped =

=

it is given that number of ways truck could be equipped=

so we have

( divide both side by 8)

There are 12 colors available