Question

A pile of 10 mobile phones is 9cm.one phone is how many mm thick?

Answer 1

.one phone = 90/10

= 9mm

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Answer 2

Answer:

A pile of mobile phone=9 cm

Thickness of one mobile phone=9/10=0.9 cm

1 cm=10 mm

0.9 cm= 9 mm

One mobile phone is 9 mm thick.