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koban [17]
3 years ago
8

a rectangular box of mass 40 kg has a length of 5m and a width of 8m and a height of 3 m find its density in kg/m3 ​

Mathematics
2 answers:
NNADVOKAT [17]3 years ago
8 0

Answer:

1/3 kg/m3

Step-by-step explanation:

density= mass/volume

mass=40 kg

volume=5m×8m×3m=120m³

density=40kg/120m³=1/3 kg/m³

matrenka [14]3 years ago
4 0

Answer:

1/3 kg per cubic m or 0.33kg per cubic m

Step-by-step explanation:

density = <u>mass</u>

                volume

= <u>     40kg      </u>    =     <u>40kg</u>

5m x 8m x 3m  =    120cubic metres

= <u>1/3 kg per cubic m or 0.33 kg per cubic m</u>

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<h3>Answer:</h3>

System

  • p + m = 10
  • 0.8m = 0.4·10

Solution

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<h3>Step-by-step explanation:</h3>

(a) Generally, the equations of interest are one that models the total amount of mixture, and one that models the amount of one of the constituents (or the ratio of constituents). Here, there are two constituents and we are given the desired ratio, so three different equations are possible describing the constituents of the mix.

For the total amount of mix:

... p + m = 10

For the quantity of peanuts in the mix:

... p + 0.2m = 0.6·10

For the quantity of almonds in the mix:

... 0.8m = 0.4·10

For the ratio of peanuts to almonds:

... (p +0.2m)/(0.8m) = 0.60/0.40

Any two (2) of these four (4) equations will serve as a system of equations that can be used to solve for the desired quantities. I like the third one because it is a "one-step" equation.

So, your system of equations could be ...

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  • 0.8m = 0.4·10

___

(b) Dividing the second equation by 0.8 gives

... m = 5

Using the first equation to find p, we have ...

... p + 5 = 10

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