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There is a rod of length $4 cm$ and another rod of length $500 mm$ has been joined to the first rod. Then the length of the rod (in cm) formed by joining these $2$ is:

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450 cm

54 cm

9 cm

4.5 cm

answer is B.

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Detailed Solution

It is given that a rod of length

4 cm

and another rod of length

500 mm

has been joined to the first rod.
We can write the following:
Length of first rod is

4 cm

.
Length of second rod is

500 mm

.
Total length of the rod by joining these two rods is

4 cm

500 mm

.
We know that,

1

centimeter = 10

mm

1

mm = \frac{1}{10}

cm

.
We need to convert

4

cm

500

mm

centimeter

4 cm

500

mm

= 4 cm + 500 mm

Now,

500

mm

= \frac{1}{10} \times 500

cm

= 50

cm

∴ 4 cm 500 mm

= 4 cm + 500 mm

= (4 + 50) cm

= 54 cm

So, option

2

is correct.

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