119. The content of manganese and tin in bronze was determined by emission spectroscopy. The relative blackening of the manganese and tin lines in the studied samples was measured. The following data were obtained.
% Mn 1.5 1.76 1.95 ?
ΔS -0.40 -0.34 -0.28 -0.30
% Sn 9.8 10.2 10.5 ?
Determine the mass fractions of manganese and tin in bronze.

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