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What Happens to the Numbers When the Ratio Changes?

GMAT-UEKKUE

A classroom has girls and boys in a $5:3$ ratio. Some number of girls and $3$ boys enter the room, changing the ratio to $7:3$.

Which of the following numbers can represent the total number of girls that entered the room?

A

$8$

B

$10$

C

$21$

D

$22$

E

$30$