Alana bought 3/8 pound of swiss cheese

And 1/4 pound of American cheese
Which pair of fraction can not be used to find how many pounds of cheese she bought in all?
6/16 and 4/16
9/24and 6/24
24/64and 8/24
15/40and 10/40

2 answers

I would have used
3/8 and 2/8, but instead they went with 6/16 and 4/16
thank you its so helpful