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The cost of 6 pens and 3 pencils is R...

The cost of 6 pens and 3 pencils is Rs 84. One-third of the cost of one pen is equal to the cost of one pencil. What is the total cost of 4 pens and 5 pencils? (a) Rs 66    (b) Rs 68    (c) Rs 72    (d) Rs 78    (e) None of these

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