Question

A pile of 10 eraser is 9.8 cm high one eraser is how many mm thick?

Answer 1

the thickness of 1 eraser = 9.8/10 = 0.98 cm = 0.98*10 mm = 9.8 mm 
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Answer 2

Height of 10 erasers = 9.8 cm = 98 mm
Height of 1 eraser = 98/10 mm = 9.8 mm

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