Study the diagram given below and answer each of the following questions.

How many persons are there who takes only coffee ?

Study the diagram given below and answer each of the following questions.

How many persons take wine?

Study the diagram given below and answer each of the following questions.

How many persons are there who take both tea and coffee but not wine ?

Study the diagram given below and answer each of the following questions.

How many persons who take tea and wine but not coffee ?

The value of $${4- \sqrt{0.04} \over 4+\sqrt{0.4} } $$  is closed to

Simplify : $$\sqrt{[(12.1)^2-(8.1)^2]÷[(0.25)^2+(0.25)(19.95)]} $$

Evaluate: $${-(4-6)^2-3(-2)+।-6।\over 18-9÷3×5}$$

$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$