Set up an equation in the following cases:
The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87. (Take the lowest score to be l.)

Solve the following: The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87. What is the lowest score?

Set up an equation in the following cases: Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. (Take m to be the number of Parmit’s marbles.)

Following data gives total marks (out of 600) obtained by six students of a particular class. Represent the data on a bar graph.

The adjoining pie chart gives the marks scored in an examination by a student in Hindi, English, Mathematics, Social Science and Science. If the total marks obtained by the students were 540, answer the following questions. In which subject did the student score 105 marks? (Hint: for 540 marks, the central angle = 360^@ So, for 105 marks, what is the central angle?)

The adjoining pie chart gives the marks scored in an examination by a student in Hindi,English,Mathematics,Social Science and Science .If the total marks obtained by the students were 540,answer the following questions: In which subject did the studdent score 105 marks?

The following data gives the marks out of 50, obtained by 25 students of a class in a test 32,23,22,18,42,18,20,17,12,9,11 Arrange them in ascending order

Marks obtained by 2500 students are shown in the following table: A student is selected at random. Find the probability that : he scores more than 80% marks.

Marks obtained by 2500 students are shown in the following table: A student is selected at random. Find the probability that : he scores less than 60% marks.