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Wildflower Petals: What Percent of Them are Purple?

GMAT-B4KDY6

A species of wildflower has petals that come in either red or purple. One particular flower is known to have $25\%$ red petals, while a second flower is known to have a total of $13$ petals, $6$ of which are purple. If the petals of both flowers are combined, the red to purple ratio becomes $2:3$.

The $6$ purple petals on the second flower make up what percentage of the total petals?

A

$24\%$

B

$28\%$

C

$20\%$

D

$36\%$

E

$18\%$