Question

The are small metal pieces each 1 cm long. ‘L’ number of metal pieces are put together to form a long thin rod. What is the length of the rod in cm?

• A. $\frac{L}{2}$
• B. 1
• C. 2L
• D. L

Answer 1

The correct option is D

L

The length of 1 metal piece = 1 cm

The rod has L metal pieces.

The total length of metal rod = Length of one metal piece × Number of metal pieces

= 1 × L

= L cm

This teaches us that by putting together small lengths of 1 unit each, I get a longer piece (rod) whose length is equal to number of pieces.