10) If the old weight was 95kg, after diet regime it became 75.8kg, what is the percentage of reduction?

 ([ 95 - 75.8] / 95  * 100 ) %   = about a 20.2% reduction

Decrease = Original Number - New Number

Decrease = 95 - 75.8 = 19.2

% Decrease = Decrease ÷ Original Number × 100
% Decrease = (19.2/95) * 100 = 20.21%

so about a 20.21% reduction.