Answer:
30 hours
Step-by-step explanation:
Creating an equation :
firstly they state : A fitness instructor exercises about 15 hours per week.
and since weeks is regarded as (w) ... we say
w = h
hence
w = 15h
meaning in 1 week the fitness instructor works out 15 hours
in 2 weeks he works out h number of hours
since the number of weeks has doubled
2w means
15*2
= 30 hours
