Others Maths Puzzle

U have to cut a Cylindrical cake of diameter 32 cm and height 20 cm in to 12 equal pieces.

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Others Other Question

obtain 277 from 3,25,50,65,100.use 4 arithmetic operations only. i travel with the speed of 2x, 3x and 5x for 3hr, 5hr and 7hr respectively. My average speed for entire journey was 65.33km/hr. what is my slowest speed ?
(A)20 (B)40 (C) 50 (D) 60