Assuming the sequence of numbers declines by 5 each time, the next three numbers would be 40, 35 and 30.
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LCM(40, 45, 50, 55) = 19800
5.
45, 50, 55
45/55 x 100 = 81.81 so 45 is 81.81% of 55
45, 46, 47, 48, 50, 50, 53, 54, 55