Question

cuboid is 20 centimetre long and 12 cm wide how high must it be so as to hold 3 litre of water

Answer 1

length= 20cm 
width=12cm
volume=3 litre=3000cm^3
height=3000\20×12
=12.5cm

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Answer 2

According to the Question

Length= 20cm  

Width = 12cm

Volume = 3 litre

Change it in Centimeter :-

= 3000 cm^3

Height = $\bf\huge\frac{3000}{20} \times12$

= 12.5 cm