Answer:
No
Explanation:
if Jacob completes 4/8 then he finishes = 0.5 half of the homework
if Jess completes 8/10 then he finishes = 0.8 'th of the homework
if Katie completes 12/15 then he finishes = 0.8 'th of the homework
thus can be concluded Jess and Katie completed same amount of their homework - 80% of the total homework, but Jacob completed only half of his homework - 50%.