Question 464859
it takes brenda 2 and 1/2 hours to mow her lawn. How much of the lawn will she have mowed after 1 hour?
.
rate of Brenda:
1 lawn per 2.5 hours
so
amount of lawn mowed is "time * rate":
1 hour * (1lawn/2.5hours) 
1/2.5
0.4 lawn
or 
4/10 lawn
or
2/5 lawn