In a coconut grove, (x + 2) trees yield 40 nuts per year, x trees yield 120 nuts per year and (x – 2) trees yield 180 nuts per year. If the average yield per year per tree be 100, find x.	Select the correct option.
A) 3 B) 4 C) 5 D) 6 E) 7
(x+2)×40+x×120+(x−2)×180/(x+2)+x+(x−2)=100   ⇒ 340x−280/3x = 100   ⇒ 40x = 280 ⇒ x = 7   Answer 7
<result>E</result>
In a coconut grove, (x + 2) trees yield 40 nuts per year, x trees yield 120 nuts per year and (x – 2) trees yield 180 nuts per year. If the average yield per year per tree be 100, find x.