Hello!
The answer is:
Garyn would plant the garden by himself in 6 hours.
Why?
From the statement, we know that Frankie can plant a garden by herself in 10 hours, but with her son's help(Garyn), they are able to do it in 4 hours.
If they are able to do the work in just 4 hours, it means that that they are able to do it in 6 hours less than Frankie working alone.
[tex]10hours-4hours=6hours[/tex]
Then, let be 10 hours, the Frankie's rate "x" and the Garyn's rate "y", so:
[tex]x-4Hours=y\\[/tex]
If x is equal to 10:
[tex]10hours-4hours=y\\[/tex]
[tex]6hours=y\\[/tex]
So, Garyn would plant the garden by himself in 6 hours.
Have a nice day!
