please answer this question very fast
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3 Pen +4 Notebook =110 rupees
Multiply by 5,
15 Pen +20 Notebook =550 rupees
7 Pen +5 Notebooks =170 rupees
Multiply by 4,
28 Pen +20 Notebook =680 rupees
15 Pen +20 Notebook =550 rupees
Equating and solving for Pen,
Cancelling notebook,
13 Pen =130 Hence,
Pen =10 rupees
Substituting,
3(10)+4 Notebook =110
4 Notebook =110−30 Hence,
Notebook =20 rupees
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