A reservoir. The depth of the reservoir is 3.5 meters. There is 2 meters of water in it. The volume of water is 18 cubic meters. How many square meters is the bottom area of the reservoir M, what's the volume of the reservoir?

A reservoir. The depth of the reservoir is 3.5 meters. There is 2 meters of water in it. The volume of water is 18 cubic meters. How many square meters is the bottom area of the reservoir M, what's the volume of the reservoir?

Bottom area of reservoir:
18 △ 2 = 9 (M2)
Reservoir volume:
9 × 3.5 = 31.5 (M3)

A cuboid reservoir is 9.2m long, 4.5m wide and 2.5m deep. How many square meters does the reservoir cover? How many cubic meters can it store water at most?

9.2 × 4.5 = 41.4 square meters
9.2 × 4.5 × 2.5 = 103.5m3
A: it covers an area of 41.4 square meters and can store 103.5 cubic meters of water at most

A cuboid reservoir is 2m long, 1m wide and 1.2m high. How many cubic meters can the reservoir store water? In order to store 3 cubic meters of water in this reservoir, how many meters higher should it be?

(1) 2 × 1 × 1.2, = 2 × 1.2, = 2.4 (M3); 3 △ (2 × 1) - 1.2, = 3 △ 2-1.2, = 1.5-1.2, = 0.3 (m); answer: the reservoir can store 2.4 m3, in order to store 3 m3, it should be increased by 0.3 M