A masonry wall having thermal conductivity of 0.75 W/m.K is subjected to the same temperature difference across it, as is the case for a composite wall having a thermal conductivity of 0.25 W/m.K and thickness of 100 mm. If the heat transfer rate through the masonry wall is 80% of the other one, then its thickness (correct to 1 decimal place) is ___________________ cm.
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