1, with cylindrical containers A and B with inner diameters of 3cm and 4cm respectively and equal depth. First, fill A with water, and then pour the water from A into B. The water depth in B is 7 cm lower than that in A. The depth of water in A is H=? Centimeter?

∵﹙3/2﹚ ? ×πH=2？ π×﹙H-7﹚

H =16cm

2. There are cylindrical containers A and B with inner diameters of 3 cm and 4 cm respectively and the same depth. Fill A with water first, and then pour the water in A into B. The water depth in B is 3 cm lower than 3/4 of that in A. The water depth in A is H=? Centimeter?

∵﹙3/2﹚ ? ×πH=2？ π×﹙3H/4-3﹚

H =16cm