The thickness of a dozen coins on a metre scale was found to be $1.8 c m$ . What is the thickness of one coin?

1.8 m m

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1.5 c m

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1.5 m m

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12 m m

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Solution

The correct option is C $1.5 m m$
The thickness of a dozen coins (i.e. 12 coins) $= 1.8 c m$ .
So, the thickness of one coin (t) will be:
$t = \frac{1.8 c m}{12} = 0.15 c m$
$t = 0.15 \times 10 m m (∵ 1 c m = 10 m m)$
$t = 1.5 m m$

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