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5/12*1200=500 -to albumy
1200-(300+500)= 400
Odp.:W bibliotece jest 400 atlasów.
5/12 + 3/12 * 1200 = 8/12 * 1200 = 2/3 * 1200 = 2400/3 = 800
Odp. W tej bibliotece jest 800 książek