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x+y = 125 x 50
100x + 50y = 8758
50x + 50y = 6250
--------------------------- -
50x = 2508
x = 2508/50
= 50,16
50y = 6250 - 50(50,16)
= 6250 - 2508
= 3742
y = 3742/50
= 74,84