$${\sqrt{4×?}}={160\over 10}$$

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

If 5x + 5 > 2 + 2x and 5x + 3 ≤ 4x + 5; then x can take which of the following values?

$$\left(4{2\over3} + {5{1\over 6}}\right)× {45 \%} \ of \ 240=?$$

25.6% of 250 +√ ? = 119

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

$$ {4\over 7}×{2{4\over 5}} ÷{2\over 5}=?$$

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____ .