A stack of 18 identical blocks is 1.44 metres high. How many blocks make a 3.2 metre stack when there are no gaps?

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Each block is 1.44 divided by 18, or 0.08 metres high, so 3.2 divided by 0.08 gives 40 blocks. Choosing 32 treats the decimal height almost like a count and does not preserve the fixed height of each block.