If $+$ means 'subtraction', $\times$ means ' division', '$÷$' means 'addition' and '$-$'means 'multiplication'. Then
$15 \times 5 + 78 – 5 ÷ 4 = ?$

 

if $+$ means '$\times$', $-$ means '$÷$', '$\times$' means '$-$' and $÷$ means '$+$', then find the value of $6 + 64 – 8 ÷ 45 \times 8 = ?$

if '$\times$' means subtraction; '$-$' means division, '$\square$' means addition and '$\%$' means multiplication, then find the value of  $13 \square 3 \times 6 \% 8 - 4 \square 14 =?$

If mathematical signs interchange from '$-$' to '$+$', '$+$' to '$÷$', '$\times$' to '$-$' and '$÷$' to '$\times$', then find out the correct answer of the given equation $6÷8+2\times 5-8=?$

In a certain code language, '$÷$' represents '$+$', '$-$' represents '$\times$', '$+$' represents '$÷$' and '$\times$' represents '$-$'. Find out the value of$8 – 14 + 7 \times 10 ÷ 9 =?$

In a certain code language, '$\times$' represents '$+$', '$+$' represents '$\times$','$-$' represents '$÷$' and '$÷$' represents ‘$-$’. Find out the value of
$25 + 2 -10 ÷ 10 \times 6 = ?$