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Because the ratio would;t be correct.

Look at this example. What is the ratio of 1cm to 1 metre?

If you went by these measurements you would get 1:1 which means 1cm is the same as 1 metre., which is false.

The correct answer means comparing 1cm with 100cm (or 1 metre) which is 1:100.

So it's really important with ratios that the units are the same.

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Q: Why should ratio be written in the same unit?

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Just convert the units to a common unit. Reminder: 1 meter = 100 centimeters. Then express as a ratio of the same unit. The units cancel in this case.

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as long as the ratio is the same you can.