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60 - 61 Maxima and minima problems of a folded page | April 23, 2020 - 2:15am |
62 - 63 Maxima and minima: cylinder inscribed in a cone and cone inscribed in a sphere | April 23, 2020 - 2:15am |
64 - 65 Maxima and minima: cone inscribed in a sphere and cone circumscribed about a sphere | April 23, 2020 - 2:15am |
66 - 68 Maxima and minima: Pyramid inscribed in a sphere and Indian tepee | April 23, 2020 - 2:15am |
69 - 71 Shortest and most economical path of motorboat | April 23, 2020 - 2:15am |