1. I feel the need to explain things first before I write the numeric value. Let x be the total number of students in the school. 25% of this value is given to be 35. (0.25)x = 35 The value of x is 140. 75% of this value is the answer which is equal to 105.
2. Let y be the alternative schools. With this, the number of charter schools is 2x - 6 which is equal to 52 2x - 6 = 52 The value of x is 29. Therefore, there are 29 charter schools.