The price of 6 pens or 12 pencils is Rs. 72 . Find the cost of 8 pens and 4 pencils.
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4. The price of 6 pens or 12 pencils is Rs. 72 . Find the cost of 8 pens and 4 pencils.

(a) Rs. 120

(b) Rs. 48

(c) Rs. 24

(d) None of these
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Solution :

$\because 6$ pens $=12$ pencils

$\therefore 1$ pen $=\frac{12}{6}$ pencils

$\therefore 8$ pens $=\frac{12}{6} \times 8=16$ pencils

$\therefore 8$ pens $+4$ pencils $=16$ pencils

$+4$ pencils

$=20$ pencils

Again.

$\because$ The price of 12 pencils = Rs. 72

$\therefore$ The price of 1 pencil $=\frac{\text { Rs. } 72}{12}$

$\therefore$ The price of 20 pencils

$$

\begin{array}{l}

=\frac{\text { Rs. } 72}{12} \times 20 \\

=\text { Rs. } 120 ; \text { Ans. }

\end{array}

$$

$\therefore$ Correct option is $=($ a)

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