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Question

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

A

$15 c m$

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B

$1.2 c m$

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C

$1.8 m m$

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D

$15 m m$

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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
= $\frac{18}{12}$ = $1.5 c m$

We know $1 c m = 10 m m$
$1.5 c m = 1.5 \times 10 = 15 m m$

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