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Ratio, SM-Bank 035 MC

The actual body length of a beetle Brad has caught is 24 mm.

A scale drawing of the beetle is shown below.

What scale is used in the drawing?

  1. \(1 \text{cm represents } 5\ \text{mm}\)
  2. \(1 \text{cm represents } 2\ \text{mm}\)
  3. \(2 \text{cm represents } 1\ \text{mm}\)
  4. \(5 \text{cm represents } 1\ \text{mm}\)
Show Answers Only

\(B\)

Show Worked Solution

\(\text{Scale:}\)

\(12\ \text{cm}: 24\ \text{mm}\) \(=120\ \text{mm}: 24\ \text{mm}=5:1\)

  
\(\text{In the options given, the ratio of}\ 5 : 1\ \text{occurs when}\)

\(\text{10 mm represents 2 mm}\ \textbf{OR}\ \text{when 1 cm represents 2 mm}\)
  

\(\Rightarrow B\)