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6.A library has to accommodate two different types of books on a shelf. The books are 6and 4 cm thick and weight 1 kg and 1 kg each, respectively. The shelf is 96 cm long anatmost can support a weight of 21 kg. How should the shelf be filled with the books oftypes in order to include the greatest number of books? Make jt as an LPP and solve itgraphically.

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