Question: A scale drawing of the car picture is 1 cm : 2 ft. Find the actual length of the car, if the length of the car picture is 4 cm.
A ) 9ft
B ) 8 ft
C ) 6 ft
D ) None of the above
Steps to derive
1 Let n be the actual length of the car.
[Write the scale and its related proportion.]
2 12 = 4n
[Write the cross products.]
3 n x 1 = 2 x 4
[Multiply.]
4 n = 8
5 The actual length of the car is 8 ft.
Hence the right answer is Option B
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