(Sorry, chinese input not available right now)
Well, the answer depends on the density of the sand.
Your first measurement is measurement of volume while the latter one is measurement of weight. You can't simply divide them and have the answer.
Extract from one of my previous post :
ADA 泥包裝是以容量為單位, 分別為9 litre 及3 litre. 由於日本是用公制, 直接把9 litre除以魚缸底(公制)面積就可以知道一包泥可填高度.
大家可利用以下 easy calculator 幫助快速計算. 其他牌子泥若果用重量為單位,計算就沒有這樣直接. 用多少包泥就只好信店主.
http://www.aqugrass.com/calvol.htm
Sorry it does not answer your question directly but hope it give you a better idea.
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