I would recommend MathPapa for this.
<em /><em /><em /><em />ms<u /><u /><u /><u /><u>re</u><u> that the answer </u><u>s 2,500</u>
The answer is already in its simplest form. You can not add the two because the have different variables. Hope this helps ;)))
105 - 90 = 15kg
500g = 1/2 kg
Peter is 15kg overweight.
15 x 2 = 30
It will take him 30 weeks for this.