$$\left({?-0.5\over 0.2} \right)={120\over 2}$$

(0.85 % of 405 ) + (2.25 % of 550 )=?

? – 2³ =(7² – 12 ) + ( 10² -17)

$$ {40 \%}\ of( {20\over 4}×?)=48$$

$${\sqrt{4×?}}={160\over 10}$$

If $$ A = {1\over 2}+{1\over 3}×{1\over 4}÷{1\over 5}-{1\over 6}$$ and $$B={1\over 2}÷{1\over 3}×{1\over 4}+{1\over 5} $$ , then what is the value of A - B?

The value of (x + y + z)³ – (y + z – x)³ – (z + x – y)³ – (x + y – z)³ is:

Find the value of the given expression.

$$ \sqrt { 20-{ \sqrt { 20- \sqrt { 20- \sqrt { 20- .....∞}}}}} $$