A bar graph is drawn to the scale of $1 c m = r$ units. the length of the bar representing a quantity $208$ units is $2.6$ cm, then find $r$

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Solution

1 cm is scaled to = r units
$\Rightarrow 2.6$ cm would be scaled to $= r \times 2.6$ units
$\Rightarrow r \times 2.6 = 208 \Rightarrow r = \frac{208}{2.6} = 80$

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