The middle rectangle is 2 km wide and 2 km high, area 4 km²,between 20 mm isohyets, so assign20 mm. Each triangular end has area 1 km². The upper triangle lies between 20 and 30 mm, mean25; the lower between 10 and 20 mm, mean15. Area-weighted rainfall is $[4(20)+1(25)+1(15)]/6=\mathbf{20}$ mm.
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