Abortion needs money from 48 yuan to buy books, and just used 65438+ 12 banknotes from 0 yuan and 5 yuan for payment. Suppose the number of banknotes used is X, and according to the meaning of the question, it is listed as follows. A

Analysis: the equivalent relationship is: 1× 1 yuan banknote quantity +5×5 yuan banknote quantity = 48.

There are (12-x) 0 yuan banknotes,

∴x+5( 12-x)=48，

So choose a.

Comments: The key to solving application problems with column equations is to find out the equivalent relationship in the problems.