Directions for questions (29 to 31): These questions are based on the following data.
There were a hundred schools in a town. Of these, the number of schools having a play-ground was 30, and these schools had neither a library nor a laboratory. The number of schools having a laboratory alone was twice the number of those having a library only. The number of schools having a laboratory as well as a library was one-fourth the number of those having a laboratory alone. The number of schools having either a laboratory or a library or both was 35.
29. How many schools had none of the three, viz., laboratory, library or play-ground?
(1) 20 (2) 5 (3) 30 (4) 35 (5) None of these
30. What was the ratio of schools having a laboratory to those having a library?
(1) 1 : 2 (2) 5 : 3 (3) 2 : 1 (4) 2 : 3 (5) None of these
31. How many schools had at least two of three, viz., laboratory, library or play-ground?
(1)10 (2)15 (3)20 (4)25 (5) None of these
Answers:
29. (4)
30. (2)
31. (5)
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