Question

8 was dividedby some numberthen added to13.next this difference was multiplied by 2 which gave a product of 30 find the answer

Answer 1

The answer is 4. 

8/x +13 = y        -------->  y * 2 = 30 

divide 2 on both sides so y = 15

8/x + 13 = 15 
      - 13     - 13 

8/x = 2 

x =4