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I need help plz don't post irrelevant questions​

Answer»

Answer:

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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