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Moderate

Equilateral Triangles

SATSTM-45GQLJ

Given the figure below where triangle $\text{MST}$ is equilateral and $\text{NP} \parallel \text{QR} \parallel \text{ST}$. What is the perimeter of the shaded region?

A

$15$

B

$20$

C

$25$

D

$30$

E

$35$