求助OG12 DS部分18题

yhmo139

og12 DS18题：
What is the maximum number of rectangular blocks, each with dimensions 12 centimeters by 6 centimeters by 4 centimeters, that will fit inside rectangluar Box X?
1 When box X is filled with the blocks and rests on a certain side, there are 25blocks in the bottom layer.
2 The inside dimensions of Box X are 60 centimeters by 30 centimeters by 20 centimeters.
小弟为此题困扰许久，甚至连题都不太明白什么意思，望高人求解，不胜感激！！

yhmo139

非常感谢~还有哈：dimension是长方体棱长的意思吗？还有如果条件一知道了大长方体的高度，但是不知道25个小长方体哪个面贴在大长方体底面上，是不是也不知道能放多少个小长方体？