Find how many dm2 of glass we need to make a block-shaped aquarium (the top is not covered) if the dimensions of the aquarium are to be: width 50 cm, length 120 cm, and height 8.5 dm.

Correct result:

S =  349 dm2


a=50 cm dm=50/10  dm=5 dm b=120 cm dm=120/10  dm=12 dm c=8.5 dm  S=a b+2 (a+b) c=5 12+2 (5+12) 8.5=349 dm2

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