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Question

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

A
1.5 cm
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B
12 mm
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C
1.5 mm
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D
1.8 mm
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Solution

The correct option is C 1.5 mm
The thickness of a dozen coins (i.e. 12 coins) =1.8 cm.
So, the thickness of one coin (t) will be:
t=1.8 cm12=0.15 cm
t=0.15×10 mm(1 cm=10 mm)
t=1.5 mm

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