The thickness of a dozen coins on a metre scale was found to be $18 c m$ . What is the thickness of one coin?

15 c m

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1.2 c m

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1.8 m m

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15 m m

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Solution

The correct option is D $15 m m$
The thickness of a dozen coins (12) $= 18 c m$ .
The thickness of one coin
$= \frac{18}{12}$ $= 1.5 c m$
$1.5 c m = 1.5 \times 10 = 15 m m$

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