A radio-active material is reduced to \(1/8\) of its original amount in 3 days. If \(8\times {10}^{-3}\mathrm{kg}\) of t…

A radio-active material is reduced to \(1/8\) of its original amount in 3 days. If \(8\times {10}^{-3}\mathrm{kg}\) of the material is left after 5 days. The initial amount of the material is:

[JEE Main 2023, 8 Apr (Shift 2)]