Government od Delhi allotted Relief Fund to help the families whose houses and shops were burned in a fire accident. The fund is represented by 6x^3- 11x^2 +15x -24. The fund is equally divided between each of the families of that accident. Each family receives an amount of 3 x – 7. After distribution 7 x +11 amount is left. The District Magistrate decided to use this amount to develop the information of the area, Find the number of families which received relief fund from Government.