Maths【question(1)】

volume of water
= (30x25x10-750)cm3
=6750cm3
depth of water now
=(6750/30)/25cm
=9cm
Therefore, the depth of water inside the tank is 9cm now.

2008-02-18 23:35:44 補充：
volume of water=(length x width x height - volume of the plants) cm3=(30 x 25 x 10 - 750) cm3=6750 cm3depth of water now=(volume of water / length / width) cm=(6750 / 30 / 25) cm=9 cmTherefore, the depth of water inside the tank is 9 cm now.

The original water height would be the total volume of the plant and the water. That mean

Water + Plant total volume is ==> 10 x 30 x 25 ==> 7500cm3

Now, the plant with volume 750cm3 has been removed.

So remain only 7500cm3 - 750cm3 ==> 6750cm3

Because the water tank length and width would not be changed, so it would just change on the water height.

30cm x 25cm x revise water height = 6750cm3

So the height of water now is 9cm