Question 11. In a school, 40% of the students draw and paint. 40% of those who draw do not paint. If the students do one of the two, then what % of students paint?

Question 12. A man purchased 40 kg of cotton at a rate of Rs 65 per kg. then he extracted  $20\%$  waste(by weight) from it so that the quality of the cotton improved and he was able to sell them at Rs.80 per kg. Also the waste had  $60\%$   cotton seed by weight which he was able to sell Rs.20 per kg. what  $\%$  profit did he make?

Question 13. Fresh grapes contain  $90\%$  water by weight and dry grapes contain  $20\%$   water by weight. The weight of dry grapes obtained from 20 kg of fresh grapes is (in kg., in decimal, up to 2 decimal places) ___

Question 14. Answer the questions based on the information given below:
Out of 210 accidents that occurred on the DND Flyway, 50 resulted in Head Injury, 105 in Chest Injury and 56 in Limb Injury. 32 suffered both Head and Chest Injury, 30 suffered both Head and Limb Injury and 45 suffered both Limb and Chest Injuries. 
The number of people having no injuries is ___.

Question 15. In a music school, three instruments are taught: Tabla, Violin and Guitar. Out of 278 students in the school, 20 learn Tabla and Violin, 23 learn Violin and Guitar and 21 learn Tabla and Guitar. 9 students learn all three instruments. It is known that the equal number of seats in all three instruments classes. (If a student is learning Guitar as well as Tabla, then he occupies two seats: one in Tabla class and one in Guitar class) 
Determine the number of students who have occupied only one seat.

Question 16. Out of 210 accidents that occurred on the DND Flyway, 50 resulted in Head Injury, 105 in Chest Injury and 56 in Limb Injury. 32 suffered both Head and Chest Injury, 30 suffered both Head and Limb Injury and 45 suffered both Limb and Chest Injuries.  
The minimum number of people who suffered all the three injuries is ___.

Question 17. In a music school, three instruments are taught: Tabla, Violin and Guitar. Out of 278 students in the school, 20 learn Tabla and Violin, 23 learn Violin and Guitar and 21 learn Tabla and Guitar. 9 students learn all three instruments. It is known that equal number of seats in all three instrument classes. (If a student is learning Guitar as well as Tabla, then he occupies two seats: one in Tabla Class and one in Guitar Class)
Determine the number of students who have occupied seats in Tabla and Violin Class but not in Guitar Class.

Question 18.  Find the maximum number of people who suffered at least one injury.

Question 19. In an examination, it was found that every student has failed in at least one subject out of the three subjects: English, Maths and Science. 28 students failed in English, 30 students failed in Maths and 32 students failed in Science. 6 students failed in English and Maths, 8 students failed in Maths and Science and 10 students failed in English and Science. The number of students who failed in only one subject is 54. Also, 20 students failed only in Maths. 
The number of students who failed in English and Science but not Maths is ___.

Question 20.  In an examination, 38% of students failed in Science and 33% failed in Maths while 19% failed in both the subjects. If the number of students who passed in only Science is 700, then determine the total number of students who appeared in the examination.