What is the maximum number of rectangular blocks, each with dimensions $12$ centimeters by $6$ centimeters by $4$

What is the maximum number of rectangular blocks, each with dimensions $12$ centimeters by $6$ centimeters by $4$ centimeters, that will fit inside a rectangular box $X?$

(1) When box $X$ is filled with the blocks and rests on a certain side, there are $25$ blocks in the bottom layer.
(2) The inside dimensions of box $X$ are $60$ centimeters by $30$ centimeters by $20$ centimeters.

Answer: B

Source: GMAT Paper Tests

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