Read the following information carefully and answer the question given below-

In the following questions the symbols @, &, $ % and * are used according to the following meaning.

‘X@Y’ means X is not less than Y.

‘X&Y’ means X is neither less than nor equal to Y.

‘X$Y’ means X is neither less than nor greater than Y.

‘X%Y’ means X is not greater than Y.

‘X*Y’ means X is neither greater than nor equal to Y.

The statements show relationship between different elements followed by two/three conclusions numbered I, II and III. Assuming that the given statements to be true find which of the conclusions is/are true and give the answer.

Statements: 
P  Q, Q @ R, R * S, S & T

Conclusions:

I. P  R

II. P & R

III. S * P

If '$-$' represented by $\text{'}\times \text{'}, \text{'}÷\text{'}$ represented by $\text{'}+\text{'}, \text{'}+\text{'}$ represented by '$÷$' and '$\times$' represented by '$-$', then $15-12+5\times 9÷12=?$

In a certain code language, '$\times$' represents '$+$', '$÷$' represents '$\times$', '$-$' represents '$÷$' and '$+$' represents '$-$' , Find out the answer to the following question.

$4\times 18÷5-10+8=?$

The following equation is incorrect. Which two signs would be interchanged to correct the equation?

$5-16\times 30÷10+4=49$

$18 \times 12 / 5 - 10 + 10$

Choose the group of mathematical signs from the given options that may replace the sign '$*$' in the following equation:

$7 * 7 * 2 * 1=12$

The following equation is incorrect. Which two signs should be interchanged to correct the equation? 

$16-2÷40+4\times 18=40$

$12-16\times 25÷80+10=7$

In a certain code language $-$ represents $\times , ÷$ represents $+, +$ represents $÷$ and $\times$ represents $-$. 

Find out the answer to the following question.

$16\times 20÷15-4+2=?$

If '$+$' and '$÷$', '$\times$' and '$-$' are interchanged in the equation $17 ÷ 7 – 27 + 7 \times 3$, then its value will be-

1. $7$
2. $17$
3. $27$
4. $41$

If the mathematical operator '$+$' means division, '$-$' means multiplication, '$\times$' means subtraction and '$÷$' means addition. Then the value of:
$11 \times 7 + 21 \times 2 ÷ 2 \times 3 - 4$ is-

1. $\frac{8}{3}$

2. $\frac{4}{3}$

3. $\frac{-4}{3}$

4. $\frac{-8}{3}$

$10 + 14 \times 20 - 7 ÷ 10 = 40$

In the given below question substitutes for various mathematical symbols, followed by a question involving the calculation of an expression is given. Put the real signs in the given equations and solve the question.

If $+$ means $\times$, $\times$ means $+$, $-$ means $÷$, $÷$ means $-$, then

$16\times 2÷4+7\times 8=?$

If '$÷$' represents '$+$', '$-$' represents '$\times$', '$+$' represents '$÷$', '$\times$'represents '$-$'. Find out the answer to the following question.

$6\times 20÷5-20+4=?$

In the given below question substitutes for various mathematical symbols, followed by a question involving the calculation of an expression is given. Put the real signs in the given equations and solve the question.

If $+$ means $÷$, $÷$ means $-$, $-$ means $\times$, $\times$ means $+$, then

$64\times 8÷6-4\times 2=?$