Give some reasons that a person might have to go on a diet

Health reasons, personal reasons.

Explanation: Feeling the need to better your diet can be for many reasons such as physical or mental health. Changing your diet can make you feel better as trying new things often do

      x/140 = 25/100

we need to find the x to find the x multiply 140 and 25

and what do you get 3500.   and what is 3500 divided by 100

= 35

be confident on yourself. ignore such fools and move on ; )