Question: maths , physics and chemistry books are stored on a library shelf that can accommodate 25 books . currently , 20 % of the shelf spots remain empty . there are twice as many maths books as physics books and the number of physics books is 4 greater than that of chemistry books . among all the books , 12 books are soft cover and the remaining are hard - cover . if there are a total of 7 hard - cover books among the maths and physics books . what is the probability r , that a book selected at random is either a hard cover book or a chemistry book ?
A)  1 / 10
B)  3 / 20
C)  1 / 5
D)  1 / 4
E)  9 / 20
Correct answer: e
Grade: 7 | Topic: Statistics and Probability | Difficulty: Hard | Standard: 7.SP.C.7