Question 814891
---Removed because of conceptual mistake---

Trying Again:


Final volume of original water, the 8 cm cube, and the added water together must be {{{25*20*8}}} {{{cm^3}}}.


Volume quantities present before adding the final water are:
{{{25*20*5+8^3}}} {{{cm^3}}}


Their difference is the amount of water, in cubic centimeters, to add.
{{{25*20*8-25*20*5-8^3}}}
{{{25*20(8-5)-8^3}}}
{{{25*20*3-8^3}}}
{{{500*3-512}}}
{{{1500-512}}}
{{{988}}} cubic centimeter, or about 0.99 liters.


Either I am still making a mistake in concept, or this answer & result, same as what I had just removed, is correct.