the cost of pen is ₹ 15 ¾ and a pencil is ₹ 4 ¼. If Rohan purchased 3 pens and 12 pencils which item cost him more and by how much
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Step-by-step explanation:
Let the cost of a pen and a pencil be x and y respectively.
4x+4y=100
x+y=25 ...(1)
3x=y+15
3x−y=15 ...(2)
Adding (1) and (2), we get
4x=40
x=10
Substitute x=10 in equation (1) to get y=15.
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