Question

5 pencils and 7 pens together cost 50 where as 7 pencils and 5 pens together cost 46.find the cost of

Answer 1

Step-by-step explanation:

let the no. of pens be x and pencil be y

according to first condition,

7x+5y=50 ----(1)

and according to second condition,

5x+7y=46 -----(2)

multiplying eq.(1) by 5 and eq.(2) by 7

new eq. formed would be ,

35x+25y=250 ------(3)

and 35x+49y=322----(4)

after solving

x=5 and y= 3

cost of pen is Rs.5 and cost of pencil is Rs.3

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Answer 2

Answer:

Step-by-step explanation:

Let the pencil be x and pens be y

A.T.Q

5x+7y=50       (a)

7x+5y=46       (b)

in equation (a) multiply 7 whereas equatin (b)is multipled by 5

35x+49y=350

35x+25y=230

(-)      (-)      (-)

---------------------

        24y=120

y=12/24

y=5

puttig y=5 in equatin (a)

5x+7y=50

5x+7(5)=50

5x+35=50

5x=15

x=3

cost of pencil is RS 3

and cost of pens=rs 5

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