math
posted by tina .
Alana bought 3/8 pound of swiss cheese and 1/4 pound of American Cheese. Which pair of fractions cannot be used to find how many pounds of cheese she bought in all
a)6/16 and 4/16
b)9/24 and 6/24
c)24/64 and 8/64
d)15/40 and 10/40

3/8 * 3/3 = 9/24
1/4 * 6/6 = 6/24