A rectangular tank can hold 650 litres of milk. If it is 130 cm long and 250 cm wide, then the height of the tank is _____.

The correct option is A 20 cm
Volume of rectangular tank
$=650litres=650\times 1000c{m}^3=650000c{m}^3$

We know, volume of a cuboid $=l\times b\times h$
$\Rightarrow 650000=130\times 250\times h$
$\Rightarrow h=\frac{\left(650000\right)}{130\times 250}=20cm$

Therefore, height of the tank is 20 cm.