Alexandra bought 8 magazines at the bookstore on Friday. On Saturday, she went back and bought 12 more. Sunday morning, she saw that the store was having a sale and she bought four times the number of magazines she did on Friday. Later that day she discovered that her dog had chewed up 4 of the magazines. How many magazines does she have now?
By adding Friday and Saturday, Alexandra bought 12+8=<<12+8=20>>20 magazines
On Sunday she buys 8*4=<<8*4=32>>32 magazines
Before her dog got to them she had 12+8+32=<<12+8+32=52>>52 magazines
After her dog chewed up some she had 52-4=<<52-4=48>>48 magazines
#### 48