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Q.

While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

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Detailed Solution

Given,
The reading of the ruler at one end, l1 = 3.0 cm
The reading of the ruler at the other end, l2 = 33.1 cm

The difference of the reading of the ruler, 

l = l2 - l1

l = 33.1 cm  3.0 cm   l = 30.1 cm

The length of the needle is 30.1 cm.

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