The no of library books in a school increased by 20% after it bought new books in May , the number increased by another 20% after a book store donated 300 books in June - Find the no of books in library before it bought new books in May

Answer 1

n = original

1.2 n = before 300

.2 * 1.2 n = 300
so
1.2 n = 1500
n = 1250 books originally

=====================
check
=====================
1.2 * 1250 = 1500
+300 = 1800
1.2*1.2*1250 = 1800 sure enough