[tex] A_{pajiste}= L_{pajiste} * l_{pajiste} =(75-2*6)*(58-2*6)=63*46= \\ =2898 m^{2} \\ A_{alee}=A_{gradina}-A_{pajiste}=L*l-2898=75*58-2898= \\ =4350-2898=1452m^{2} \\ Volum_{nisip}= 100*726dm ^{3} \\ h_{nisip}= \frac{volum_{nisip}}{A_{alee}} = \frac{72600dm ^{3}}{1452m^{2}} =\frac{72600dm ^{3}}{145200dm^{2}}=0,5dm=5cm[/tex]