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X=no. of rows
2x-10=no. of trees in each row

600=2x^{2} -10x
\frac{0}{2} = \frac{2x^{2} -10x-600}{2}
0= x^{2}-5x-300
X=-15, x=20
Disregard x=-15

X=20 <---- no. of rows
           =30 <---- no. of trees in each row
0 0 0
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