Class Schedules In a survey of 77 students at a local college, the following information was gathered: 45 students had a class at eight o’clock in the morning, 43 students had a class at nine o’clock in the morning, 47 students had a class at 10 o’clock in the morning. Twenty-six students had an 8:00 A.M. and a 9:00 a.m.class, 24 students had an 8:00 A.M. and a 10:00 A.M. class, and 25 students had a 9:00 A.M. and a 10:00 A.M. class. Eleven students had classes at 8:00, 9:00, and 10:00 A.M.
a. How many students did not have a class at any of the three times?
b. How many students had a class at 9:00 A.M. and 10:00 A.M., but not at 8:00 A.M.?
c. How many did not have an 8:00 a.m.class ?
d. How many students had a class at 8:00 A.M. or at 10:00 A.M.?
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