Kim ate 3/4 of a bag of potato chips sandy ate 3/7 of a bag and Jeff ate 3/9 of a bag who ate more

Kim ate 3/4 of the bag, which means she ate 0.75 of the bag.

Sandy ate 3/7 of the the bag, which means she ate 0.43 of the bag.

Jeff ate 3/9 of the back, which means he ate 0.33 of the bag.

Therefore, Kim ate the most potato chips from the bag.

(Divide 3/4 to give you 0.75, and so on.)