Taylor = T
Skylar = S
Equation
T = S + 13
Proportion
7T :: 4S
If Skylar worked 10 hours, Taylor worked 23 hours Proportion = 2.3
If skylar worked 5 hours, Taylor worked 18 hours Proportion = 3.6
Proportion
7/4 = 1.75 the proportion must be 1.75
ok
Equation

Taylor worked 30.333 hours
Skyler worked 17.333 hours