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A rectangular container containing a solution has a square base.
The edge of the base and the height of the container are in the ratio 7 : 9.
The combined length of the edge of the base and the height of the container is half of 512 cm.
(a) What is the area of the square base?
(b) After seven identical iron balls are put into the container, the level of the solution in the container goes up by 1.75 cm.
Find the volume of each iron ball.
Notes to students: