David W. answered 12/05/18
Experienced Prof
"the number of working hours, t, as a math tutor and the number of working hours, s, at the grocery store?"
t = umber of working hours as a math tutor
s= number of working hours at the grocery store
"no fewer than 20 total hours at the two jobs"
s + t ≥ 20
"at least 5 more hours working as a math tutor than she spends working at the grocery store"
t - s ≥ 5