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     EduGorilla 
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    A group of war planes can completely destroy a certain place in 9 days. However, 15 planes developed technical faults. The remaining planes can do the job in 18 days. Find the original number of war planes.

    Options :-

    1. 39 planes
    2. 40 planes
    3. 41 planes
    4. 30 planes
    5. 36 planes
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