We have the following:
where, V is the volume 150 liters
l is the long = 100 cm
w is the wide = 60 cm
h is the height = ?
We must convert liters to cubic centimeters, as follows:
![\begin{gathered} 1L=1000\operatorname{cm}^3 \\ 150L\cdot\frac{1000\operatorname{cm}}{1L}=150000\operatorname{cm} \\ \end{gathered}]()
The height if you fill half of tank (150000/2 = 75000 cm^3):
![\begin{gathered} h=(V)/(l\cdot w) \\ h=\frac{75000\operatorname{cm}^3}{60\operatorname{cm}\cdot100\operatorname{cm}}=12.5\operatorname{cm} \end{gathered}]()
Therefore, the height is 12.5 centimeters