Box distribution (system of equations): Find the number of balls in the green box. Three boxes: Red (R), Green (G), Blue (B) with a total of 108 balls. G + R is twice B. B is twice R. Compute the number of balls in the green box. Choose the correct value.

Translate to equations G + R = 2B, and B = 2R.

Solve Substitute B = 2R into G + R = 2B ⇒ G + R = 4R ⇒ G = 3R. Total: R + G + B = R + 3R + 2R = 6R = 108 ⇒ R = 18. Then G = 3R = 54.

Note Since 54 is not among the numeric options, the correct choice by label would be "None of these", but the actual value is 54.