1, and the height of liquid medicine accounts for 6/ 15=0.4 of the total height.

So to put it another way, the height is 0.4 * 10 = 4cm.

2. Let the length, width and height be a, b and c respectively.

A*b= 12，a*c=8，b*c=6。

Volume = a * b * c = √ (a * b) * (a * c) * (b * c) = √12 * 8 * 6 = √ 576 = 24.

3. Painting area = 8 * 5.5+8 * 4 * 2+5.5 * 4 * 2-22 =130m2.

Paint required = 130 * 0.4 = 52kg.