8. Working together, two dock workers can load a crate in 6 min. One of the dock workers, working alone, can load the crate in 15 min. How long would it take the other dock worker,
working alone, to load the crate?

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

maya’s expression will generate the wrong sum because she violated the commutative property.

step-by-step explanation: