Scale factor

(a)
The diagram shows a scale drawing of a monsquito. The actual size of the mosquito is 1 cm and the size in the diagram is 5 cm.
the scale of the drawing
=5 cm: 1cm
=5:1
=1:1/5
(b)
the actual length of the wing
=2.5*(1/5)
=0.5 cm
=5 mm


2007-02-14 00:05:03 補充：
I agree with the answerFor the map, we say 1:20000 and the map is smaller than the real worldNow the drawing is bigger than the real thing. So the scale should be written 1:1/5 or 5:1isn't it?