please tell the question 4
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cost of 1 notebook=rupees 18
cost of 3pens minus cost of notebook =72-18
=54
now ,cost of 3 pens is 54
cost of 1 pen =54÷3
=18 rupees
hence proved
cost of 3pens minus cost of notebook =72-18
=54
now ,cost of 3 pens is 54
cost of 1 pen =54÷3
=18 rupees
hence proved
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