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5 dozen pens, 120 pens

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Given that

First quantity as 5 dozen pens and

second quantity as 120 pens

For writing the ratio of the given quantities,

First, we have to keep both quantities in the same unit.

Therefore, first quantity can be written as 60 pens because 1 dozen = 12 quantity

Now, as per the question,

Ratio of second quantity to first quantity can be written as

120 pens: 60 pens

$ \Rightarrow $120: 60

$ \Rightarrow \dfrac{{120}}{{60}}$

Since, HCF of 60 and 120 is 60.

Thus, on dividing the numerator and denominator, we have

$\begin{gathered}

\Rightarrow \dfrac{{120 \div 60}}{{60:60}} \\

\Rightarrow \dfrac{2}{1} \\

\Rightarrow 2:1 \\

\end{gathered} $

$\therefore $Required ratio = 2:1