1. On a horizontal coordinate line, several integers are marked as points, the sum of which is equal to 25. If each point is moved 5 unit segments to the left, then the sum of the numbers corresponding to these points will become equal to -35. How many numbers were marked on the line?
1. The sum of the numbers decreased by $25-(-35)=60$. Therefore, $60: 5=12$ numbers were marked.