The density of a material in SI units is 128 kg `m^(-3)`. In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is :

Explanation

Density of material in SI unit,
`=(128kg)/(m^(3))`
Density of material in new system
`=(128(50g)(20))/((25cm)^(3)(4)^(3))`
`=128/64xx(20)=40` unit