Question

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

• A. $450cm$
• B. $4.5cm$
• C. $54cm$
• D. $9cm$

Answer 1

Answer: (C)

Length of first Rod is $4cm$

Length of second Rod is $500mm$

Total Length of the Rod by joining these two rods is $4cm$ $500mm$

We know that, $1$ $centimeter=10$ $mm$, $1$ $mm=\frac{1}{10}$ $cm$

We need to convert $4$ $cm$ $500$ $mm$ to $centimeter$

$4cm$ $500$ $mm$ $=4cm+500mm$

Now, $500$ $mm=\frac{1}{10}\times 500$ $cm$ $=50$ $cm$

$\therefore 4cm500mm=4cm+500mm=(4+50)cm$ $=54cm$

So, Option $B$ is correct