# How is this problem answered? I understand that you divide the length by 50, but does 'actual' mean to measure the shape (4cm) x  by 50?

How is this problem solved. I understand that you divide 50 by 18, but does 'actual' mean to measure the shape (4cm) ..and x that by 50? Relevance
• What scale tells you is 1 on here = 50 on there(the building)

1 cm = 50cm on the building

18cm here = 900 on the building (9meters).

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• The plan clearly states that it is drawn to scale.  The actual measurement is the real size of the wall, not what you see on paper.  For every cm you measure on paper the real or actual size is 50 cm. Since the length is 18 cm the real or actual length of the wall is 18 X 50 = 900 cm or 9 m.

The shape of the figure is 4 cm only because the drawing has to fit on the sheet of paper.  If you were required to use 4 cm as the scale you would have been given that information.

You can also use ratio to solve the problem

Scale / real (actual) = Scale / real (actual)

1 / 50 =  18 / x

x = 50 X 18

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• 1 unit in picture = 50 times that in real life

so you don't divide by 50 , you multiply

18 cm *50 = 50 *0.18 meters = 9 meters

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