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Math·Algebra·Linear equations in two variables

easy

A total of 3 squares each have side length r. A total of 6 equilateral triangles each have side length t. None of these squares and triangles shares a side. The sum of the perimeters of all these squares and triangles is 270. Which equation represents this situation?

A

$9r+24t=270$

B

$3r+6t=270$

C

$12r+18t=270$

D

$6r+3t=270$