The total cost of 8 pens and 5 pencils is 92
and the total cost of 5 pens and 8 pencils is 77.
heir ages.
Find the cost of 2 pencils and 3 pens.
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Let the cost of pen be x and pencil be y,
ATQ
5x+6y=9 ...(i)
and
3x+2y-=5 ...(ii)
solving (i) and (ii) by eliminatory method we get;
5x+6y=9
3x+2y=5( Multiply by 3)
-> 9x+6y=15 ...(iii)
From (i) and (iii)
5x + 6y= 9
9x + 6y= 15
(-) (-) (-)
------------------------
4x = 6
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or x= 1.5
Substituting the value of x in (ii) we get
3(1.5)+ 2y=5
->4.5+2y=5
->2y= 5-4.5
-> y=0.5/2
->y=0.25
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