20 students are getting 'letter marks' either in Mathematics or in Advanced Mathematics. If 12 of them get letter marks in Mathematics and 9 of them in both, how many of them get letter marks in Adv. Mathematics.

There are 60 students in a class. Out of them 25 students play foot ball and 20 students play cricket and 10 of them play both , how many of them play neither are.

72% of 25 students are good in mathematics. How many are not good in mathematics?

In a class test,the sum of Shefail marks in Mathematics and English is 30.Had she got 2 marks more in Mathematics and 3 marks less in English ,the product of their mark would have been 210.Find her marks in the two subjects.

In a hotel there are 100 students. Out of them 80 like to take tea and 40 like to take coffee. If 26 of them don't like to take tea and coffee both, how many of them like both ?

In a class 18 students offered Physics, 23 offered Chemistry and 24 offered Mathematics. Of them, 13 offered both Chemistry and Mathematics, 12 offered both Physics and Chemistry, 11 offered both Mathematics and Physics and 6 offered all three. Find the number of students in the class.

Out of 45 students, 22 of them can speak only Hindi and 11 of them can speak both English and Hindi. How many of them can speak only English ?

The practical marks in Mathematics secured by 9 students are 16,13,11,x,12,10,16,15 and 14.If the mean of these marks is 14,find the value of x.

Among the number of students in a class 25 read physics.30 read chemistry and 20 read mathematics.If 12 read both physics and chemistry,15 read chemistry and mathematics,18 read physics and mathematics and 10 read all the three subjects find the number of students in the class.

There are 102 students in a class. In an examination, 50 of them failed in Mathematics, 45 failed in Physics and 40 failed in Chemistry, 32 failed in exactly two of these three subjects. Only one student passed in all the three subjects. Find the number of students failing in all the three subjects.

Among a group of 90 students,40 like mathematics and 60 like chemistry.If 6 students like neither,find how many like both the subjects?