Reena's shoe is 20.2 cm long. Aditi's shoe is 7 mm longer than Reena's shoe. How long is Aditi's shoe in cm?

20.2 cm

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20.4 cm

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20.7 cm

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20.9 cm

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Solution

The correct option is D 20.9 cm
Length of Reena's shoe = 20.2 cm
Length of Aditi's shoe
= 20.2 cm + 7 mm

Now,
20.2 cm + 7 mm
= 202 mm + 7 mm [10 mm = 1 cm]
= 209 mm
= 200 mm + 9 mm
= 20 cm + 9 mm
= 20.9 cm

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