Answer:
49
Step-by-step explanation:
Total number of students =100
Out of the 50 students in the age group 7−12 years who participated in the survey, 23 liked adventure or biography.
So, 50-23 = 27 Out of the 50 students in the age group 7−12 years who participated in the survey liked detective
Now we are given that The total number of students of both age groups who liked detective books was 28.
No. of students of age group 13-17 who like detective books = Students of both age group like detective - No.of students of 7−12 years who liked detective = 28-27 =1
So ,The total number of students of both age groups who liked adventure or biography was 100-28 = 72
Since the age group 7−12 years who participated in the survey, 23 liked adventure or biography.
So, the age group 13-17 years who participated in the survey liked adventure or biography = 72-23=49
Age group Adventure or Biography Detective Total
7-12 23 27 50
13-18 49 1 50
Total 72 28 100
So, Option C is true.
The total number of students in the age group 13−18 years who liked adventure or biography. is 49