Container Q, measuring 80 cm by 30 cm by 31 cm, was filled with water to the brim. Water was then poured from Container Q to Container R, which has a base area of 660 cm² until the height of the water level in Container R became twice that of the water level in Container Q. Find the volume of water in Container R, leaving your answer in cubic cm.
Volume of Container Q
= 80 x 30 x 31
= 74400 cm³ 

Base area of Container Q 
= 80 x 30
= 2400 cm²

Total base areas
= 2400 + 660 + 660
= 3720 cm² 

Height of the water level in Container Q after pouring
= 74400 ÷ 3720
= 20 cm

Height of the water level in Container R after pouring
= 2 x 20 
= 40 cm

Volume of water in Container R
= 660 x 40
= 26400 cm³ 

Answer(s): 26400 cm³