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5×2,5×2=15m²
4×2,5×2≡12m²
20+15+12=47m²
Odp. Potrzeba 47 m² farby.
2×4×2,5=20m²
to była powierzchnia scian
sufit:
4×5=20m²
razem do pomalowania:25+20+20-5=60m²
60m²:12m²=5 litrów farby trzeba kupić
Pb=2x(2.5mx5m)+2x(2.5mx4m)=25m+20m=45m2
45m2-5m2=40m2
40m2:12m2=3,4
Trzeba kupić 3 litry farby