 
 <translate> Give the step-by-step reasoning process and then the final answer. Henry needs to declutter his book collection of 99 books. From his bookshelf, he was able to fill 3 boxes of 15 books each to take to a donation center. He had 21 books in a room he could donate, 4 on his coffee table and 18 cookbooks stashed in the kitchen. When he dropped them off, he noticed a box of books that had a "free to a good home" note. He grabbed 12 books to take back to his place. How many books does Henry now have? <hau> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. Henry yana bukatar kawar da tarin littafinsa na littattafai 99. Daga ɗakunan littattafansa, ya cika akwatuna 3 da kowane ɗaya yana ɗauke da littattafai 15 da zai kai wurin ba da gudummawa. Yana da littattafai 21 a cikin ɗakin da zai iya ba da kyauta, 4 a kan teburin kofi da kuma littattafan girke-girke 18 da aka ɓoye a cikin ɗakin abinci. Sa'ad da ya kawo su, ya ga akwatin littattafai da ke ɗauke da "kyauta ga gida mai kyau". Ya ɗauki littattafai 12 ya kai gidansu. Littattafai nawa ne Henry yake da su yanzu? 