If the time has a 8 in
it, it has to be
8 o'clock

No

Step-by-step explain:

It does not have to be 8 o'clock for the time to have an 8.

No it would only be 8 o’clock if it was like 8:00 but if it’s 8:01 it wouldn’t have the o’clock

Let x be the number of apples 
Let y be the number of oranges 

x+y≤20 
0.24x+0.8y≤12

x≤20-y 

0.24(20-y)+0.8y≤12
4.8-0.24y+0.8y≤12
0.56y≤7.2
y=12.9 (you can choose 12 here, since you can't have a fraction of an orange sold) 

x= 7.14 (again, rounding this off to 7) 

Therefore, Darcy got 12 oranges and 7 apples. 

Hope I helped :)