What will come in place of question mark(?) in the following questions?
`7/{10} - ? = 3/{10}`

Answer the following questions : What is fermentation ?

Find the angles marked with a question mark shown in Figure:

Evaluate the following : |-7|+|10|

Find the following: 7/(10)+2/(10)

The number of different ways of assigning 10 marks to 3 questions is

Look at the figure and answer the following questions: Where is the object placed?

The following histogram depicts the marks obtained by 45 students of a class: Figure: Look at the histogram and answer the following questions: What is the class size? How many students obtained less than 10 marks? How many students obtained 30 or more marks but less than 40? What is the interval of highest marks and how many students are there in this interval? If passing marks are 30, what is the number of failures?