1.

In a coconut grove, (x - 2) trees yield 60 nuts per year, x trees yield 120 nuts per year and (x + 2) trees yield 180 nuts per year. If the average yield per tree be 10, find x.1). 132). 123). 154). 16

Answer»

Given, AVERAGE YIELD per tree is 10,

⇒ 10 = $(\FRAC{{Total\;yield}}{{Total\;no.\;of\;trees}} = \frac{{60\; + \;120\; + \;180}}{{\left( {x - 2} \right)\; + \;x\; + \;\left( {x + 2} \right)}} = \frac{{360}}{{3x}})$

⇒ 10 = 120/x

⇒ x = 12


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