Question 1098870
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You have 2 (two) options:



<U>Option 1</U>


<pre>
Solve the quadratic equation 

t*(t+5) = 864,

where t is the number of trees in each row.
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<U>Option 2</U>


<pre>
Find (MENTALLY) two factors of the number 864 that multiply up to 864 and differ by 5 units:

864 = 2*432 = 4*216 = 8*108 = 16*54 = 32*27 . . .    Oops !  You just found them:


<U>Answer</U>.  The number of trees in each row is 27.


<U>Check</U>.  27*(27+5) = 27*32 = 864.
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