In a certain code language, ‘+’ represents ‘x’, ‘ – ‘ represent ‘+’, ‘x’ represent ‘÷’ and ‘÷’ represents ‘-‘. What  is the answer to the following question
15 – 5  + 25 ÷ 10 =?

If ‘-’ stands for ‘division’, ‘+’ for ‘multiplication’, ‘÷’ for ‘subtraction’ and ‘×’ for ‘addition’, which one of the following equations is correct? 

Select the correct combination of mathematical signs to replace * signs and to balance the equation.
2000 * 1300 * 20 * 20 * 300

Which of the following interchange of signs would make the given equation correct?
6000 + 400 x 300 - 900 ÷ 300 = 3900

By interchanging which two signs the equation will be correct?
9 + 6 × 2 ÷ 4 – 6 = 15

If the mathematical operators, ‘+’ and ‘×’ are interchanged, what will be the value of the equation 9÷ 5+10–23×2

If ‘+’ means ‘×’, ‘-’ means ‘÷’, ‘×’ means ‘+’ and ‘÷’ means ‘-’ then what is the value of a given equation?
225 ÷ 5 + 96 – 3 × 31 

In the following question, by using which mathematical operator will the expression become correct?
18 ?6 ? 9 ? 27