Find the length of the remaining ribbon.

20 m 10 cm

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20 m 30 cm

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80 m 30 cm

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None of the above

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Solution

The correct option is A 20 m 10 cm
$Total length of ribbon available = 50 m 20 cm$
$Length of ribbon used = 30 m 10 cm$

So,

Subtracting the common units separately, we see:

So, length of the remaining ribbon is 20 m 10 cm.

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