1. There is a cylindrical container with a height of 8cm and a volume of 50ml. The bottom area is 50 ÷ 8 = 6.25 (square centimeter).

The volume of 8 cm cylinder is the volume of splashing water: 6.25× (8-6) = 12.5 (cubic centimeter).

The cylinder length of 16cm is twice that of 8cm, so the cylinder volume is: 12.5x2 = 25 (cubic centimeter).

The complete formula is: 50 ÷ 8× (8-6 )× (16 ÷ 8) = 25 (cubic centimeter).

2. There is a cylindrical barrel with a diameter of 40 cm at the bottom and a depth of 90 cm. According to the volume formula of cylinder, the volume of water is:

(40 ÷ 2) × (40 ÷ 2 )× 3.14× 90 =113040 (cubic centimeter)

Now pour all the filled water into another rectangular water tank. It is known that the bottom area inside the rectangular tank is 47. 1 square decimeter =47 10 square centimeter. It can be found that the height of water injected into the water tank is:

113040 ÷ 4710 = 24 (cm)

Because the sink is still empty after pouring 1/5, the height of the inner wall of this sink is:

(1- 1/5) = 30 (cm)

hope this helps