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Question

Find the ratio of 1m20cm:3m20cmin the simplest form.


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Solution

Step 1: Converting the numbers into the same unit

To find the ratio of two quantities their units must be the same.

We know that 1m=100cm

1m20cm =1×100+20cm

=100cm+20cm

=120cm

3m20cm=3×100+20cm

=300cm+20cm

=320cm


Step 2: Finding the ratio

1m20cm:3m20cm

=1m20cm3m20cm

=120cm320cm

=1232=4×34×8=38
Here, 3 and 8 have no common factor other than1.
Thus, 38 is the simplest form of fraction 120320

Hence, the simplest ratio is 3:8.


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