Rectangular 7647

There are 140 liters of water in a rectangular aquarium with 800 mm and 50 cm base dimensions. How high in cm does the water level reach? What is the area in dm2 of the inner walls of this aquarium up to the water level?

Correct answer:

h =  35 cm
S2 =  91 dm2

Step-by-step explanation:

a=800 mm cm=800:10  cm=80 cm b=50 cm V=140 l cm3=140 1000  cm3=140000 cm3  S1=a b=80 50=4000 cm2  h=V/S1=140000/4000=35 cm
S=2 (a+b) h=2 (80+50) 35=9100 cm2 S2=S dm2=S:100  dm2=9100:100  dm2=91 dm2=91 dm2

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