Simon has a scale model of the concorde airplane. the actual length of the concorde is approximately 200 feet. if the ratio of the actual length in feet to the length of the model in centimeters is 5 : 1, what is the approximate length of simon's model?

The answer is:  "40 cm " .
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Note:
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 ;

Solve for "x" (in "cm" ) ; 

→  5x = 200 * 1 ; 

→  5x = 200 ; 

Divide each side of the equation by "5" ; 
   to isolate "x" on one side of the equation; & to solve for "x" ; 

→  5x / 5 = 200 / 5 ; 

to get:

→  x = 40 .
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The answer is:  " 40 cm " .
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The density of the cube is 40