一道SAT数学,读不懂题
Thepatternshownaboveiscomposedofrectangles.Thispatternisusedrepeatedlytocompletelycoverarectangularregion12Lunitslongand10Lunitswide.HowmanyrectanglesofdimensionLbyWareneeded
图就不上了,尤其不明白什么是HowmanyrectanglesofdimensionLbyWareneeded
这个LbyW怎么讲呢
求指教