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Darya [45]
3 years ago
14

The density of a certain type of paint is 1.2 grams per cubic centimeter. A garage door that is 3 meters tall and 7 meters wide

is to be painted with a 1-millimeter-thick coat of paint (on the outside only). What is the mass (in grams) of the paint that will be needed to paint the door?
Mathematics
1 answer:
Naily [24]3 years ago
5 0
We know that
density=mass/volume
solve for mass
mass=density*volume

step 1
find the area of the garage door in cm²<span>
Area=300*700------> 210000 cm</span>²

step 2
find the volume of the paint
Volume=area*thick
thick=1 mm-----> 0.1 cm
Volume=210000*0.1-----> 21000 cm³

step 3
find the mass
mass=density*volume
density=1.2 g/cm³
volume=21000 cm³
mass=1.2*21000-----> 25200 grams

the answer is
25200 grams
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