A cuboid fish tank measures four fifths of a meter in length, one fourth of a meter in width and one half of a meter in height. The depth of the fish tank is three tenths of a meter. How much water is there in the fish tank Square meter

Answer: the cubic number of water = 3 / 10 * 4 / 5 * 1 / 4 = 3 / 50 cubic meters

A cuboid goldfish tank, measured from the inside, is 4 / 5 meters long, 1 / 4 meters wide and 1 / 2 meters high. The depth of water in the tank is 3 / 10 meters. What is the maximum cubic decimeter of water in the tank?

Length 4 / 5m = 8 decimeters, width 1 / 4m = 2.5 decimeters, height 1 / 2m = 5 decimeters‘
How much is the most water in the fish tank, that is, the volume of the fish tank
8 × 2.5 × 5 = 100 cubic decimeter

The width of a rectangle is 40 meters, which is equivalent to two fifths of its length. How many square meters is the area of this land?

40÷2/5×40=4000cm

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