Judy read 1/2 (one-half) of the total book on friday night. on saturday night, she read 2/7 (two-seventh) of the total book. what fraction of the total book does she have left to read?

So the queston is asking 1/2+2/7+x=1/1=whole book
to add fractions, we must make sure that the denomenators are the same sso
1/2=7/14
2/7=4/14
7/14+4/14=11/14
11/14+x=14/14
subtract 11/14 from both sides
x=3/14
3/14 of the book left to read