489. When positive integer m is divided by positive integer n, the remainder is 12. If m/n = 24.2, what is the value of n ?

490. The dimensions of a rectangular solid are 4 inches, 5 inches, and 8 inches. If a cube, a side of which is equal to one of the dimensions of the rectangular solid, is placed entirely within the rectangular solid, what the ratio of the volume of the cube to the volume within the rectangular solid that is not occupied by the cube?

491. Working independently at their respective constant rates, machines X and Y took 15 minutes to fill an order. What fraction of the order was filled by machine X?

(1) Working alone at its constant rate, machine X would have taken 60 minutes to fill the order.
(2) Working alone at its constant rate, machine Y would have taken 20 minutes to fill the order.

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