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Q14 pls help

$T o t a l y i e l d s = (x + 2) \times 60 + x \times 120 + (x - 2) \times 180 = 60 x + 120 + 120 x + 180 x - 360 = 360 x - 240 A n d, T o t a l t r e e s = (x + 2) + x + (x - 2) = 3 x G i v e n, A v e r a g e y i e l d s p e r y e a r p e r t r e e = 100 N o w, A v e r a g e y i e l d s = \frac{T o t a l y i e l d s}{T o t a l t r e e s} \Rightarrow 100 = \frac{360 x - 240}{3 x} \Rightarrow 300 x = 360 x - 240 \Rightarrow 60 x = 240 \Rightarrow x = 4 T h u s, o p t i o n (A) i s c o r r e c t .$

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