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The Ratio of Red and Blue Marbles

GRE-VYPXEG

A jar contains 50 marbles, each of which is blue or red. If 35 of the marbles are red, which of the following does NOT represent the ratio of the number of red marbles to the number of blue marbles?

A

$35:15$

B

$\cfrac{7}{3}$

C

$\cfrac{35}{15}$

D

$7:3$

E

$\cfrac{35}{50}$