Physics Help: The microstructure of an Al-Si alloy contains 12 wt% eutectic and 88 wt% proeutectic

The microstructure of an Al-Si alloy contains 12 wt% eutectic and 88 wt% proeutectic
, what is the composition of the alloy in wt% Si units? Assume the room temperature microstructure is the same as the phase/microconstituent content just below the eutectic temperature.

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