Solution Hints: 9CHS 2019

Q1:  

Let the value of pen be x
let the value if pencil be y
37x+53y=320……….(1)
53x+37y=400…………..(2)
on multiplying eq-1 by 53 and eq-2 by 37
1961x+2809y=16960
1961x+1369y=14800
on subtracting
1440y=2160
y=Rs1.5
so x=
37x+53*1.5=320
37x+79.5=320
37x=320-79.5
37x=240.5
x=Rs6.5
so cost of pen is Rs 6.5 and cost of pencil is Rs 1.5

So, Cost of 2 pens : 2 x 6.5 = ₹13.00

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