1.

the cost of two pencil and eraser is rupees 20 and the cost of 4 pencil and 6 eraser is rupees 44 find the cost of pencil and eraser​

Answer»

Step-by-step explanation:

let \: the \: cost \: of \: each \: pencil \: be \: - x \\ \\ and \: costof \: each \: eraser \: be \: - y \\ \\ then \: according \: to \: given \: condition \: -

2x + y = 20 \\ \\ then \: x = \frac{20 - y}{2}

2nd case-

4x + 6y = 44 \\ \\ put \: value \: of \: \: x \: - \\ \\ 4 \times \frac{20 - y}{2} + 6y = 44

40 - 4y + 6y = 44 \\ \\ 2y = 44 - 40 \\ \\ y = \frac{4}{2} \\ therefore \: y \: = 2 \\ \\ thus \: cost \: of \: each \: eraser \: = \: \\ \\

2 RS

and

cost \: of \: each \: eraser \: (x) =

\frac{20 - 2}{2} \\ \\ = \frac{18}{2} = <klux>9</klux>

=9 Rs


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