You have this coupon for a restaurant. You save $3 on a meal. What was the original cost of the meal? If the meal was 25% off.

\(100-75=25\) 

  x    -   9     =     3  "25% was the discount and you saved 3, which means the discount was 3 dollars, then you can find the paid (After the discount by cross multiplication i.e. 3*75/25 will give you 9) 

thus x=12 

3 is 25% of 12