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If $18$ notebooks cost $R s .333$ , find the cost of $6$ notebooks?

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Cost of $18$ notebooks $=$ Rs. $333$

Cost of $1$ notebooks $=$ Rs. $\frac{333}{18} =$ Rs. $\frac{111}{6}$

Cost of $6$ notebooks $=$ Rs. $\frac{111}{6} \times 6 =$ Rs. $111$

$∴$ Cost of $6$ notebooks is Rs. $111$

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