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my approach
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cur_worst: 642 = 2769 * 120 / 517
moved: +2
amount: 2127 = 2769 - 642
ratings_sum: 397 = 517 - 120
cur_worst: 991 = 2127 * 185 / 397
moved: +4
amount: 1136 = 2127 - 991
ratings_sum: 212 = 397 - 185
moved: +4

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nielsm's approach
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cur_worst: 426 = 2769 * 120 * 120 / 93569
moved: +1
amount: 2343 = 2769 - 426
ratings_square_sum: 79169 = 93569 - 120 * 120
cur_worst: 1012 = 2343 * 185 * 185 / 79169
moved: +5
amount: 1331 = 2343 - 1012
ratings_square_sum: 44944 = 79169 - 185 * 185
moved: +5


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master approach
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worst_cargo: 1290 = 2769 * 185 / (212 + 185)
moved: 6
amount - worst_cargo: 1479 = 2769 - 1290
moved: +5