In a coconut grove, (x + 1) trees yield 60 nuts per year, x trees yield 120 nuts per year and (x – 1) trees yield 180 nuts per year. If the average yield per year per tree be 100, find x. Select:
A) 2 B) 4 C) 5 D) 6 E) None of the above
(x+1)×60+x×120+(x−1)×180/(x+1)+x+(x−1)=100   ⇒ 360x−120/3x = 100   ⇒ 60x = 120 ⇒ x = 2   2nswer 2
<result>A</result>
In a coconut grove, (x + 1) trees yield 60 nuts per year, x trees yield 120 nuts per year and (x – 1) trees yield 180 nuts per year. If the average yield per year per tree be 100, find x.