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2. Division
Example: 250÷20
Solution: Align 25 on the outside scale with 20 on the inside scale. On the
outside scale read the 12.5 mark that is aligned with 10 on the inside
scale. Figure the number of decimal places, and the answer is 12.5.
3. Reading ratios
Example: 30/20 = 60/x
Solution: Align 30 on the outside scale with 20 on the inside scale.
At this time, the answer of 40 can be read from the inside scale
corresponding to 60 on the outside scale.
In addition, the ratio of the value on the outside scale to the value on
the inside scale is 30:20 at all positions on the scales.
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