If p presents cost of 3 notebooks find the cost of 9 notebooks
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cost of 3 nb=p
1 nb cost=p/3
cost of 9 nb =9×p/3
=3p
1 nb cost=p/3
cost of 9 nb =9×p/3
=3p
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cost of 3 notebooks=p
cost of 1 notebook= p/3
cost of 9 notebooks= 9×p/3
= 3p
cost of 1 notebook= p/3
cost of 9 notebooks= 9×p/3
= 3p
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