You have some different type of books. These are: 15 comic books, 20 novels and 12 story books.
You have given 5 novels to your friend.
You obtained 30 story books from your other friend.
You have thrown away 10 comic books.
How many books do you have now in total?
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i have already= 1 5 + 2 0 + 1 2 = 4 7 books
i obtained 30 books from a friend.so, now i have = 4 7 + 3 0 = 7 7 books
i gave and threw 5 + 1 0 = 1 5 books.so, now i have = 7 7 − 1 5 = 6 2 books.