Explanation:
the perimeter of an aluminium sheet is 120 CM if its length is reduced by 10% and its breadth is increased by 20% the perimeter does not change find the measure of the length and the breadth of the sheet
 
        
             
        
        
        
send attached file with it
 
        
                    
             
        
        
        
See how long I can hold the key down. I forgot there was a max :/
  
hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
 
        
             
        
        
        
Answer:
public static void init(int[] arr, int n) {
     if (n==0)
         arr[0] = 0;
     else {
         arr[n-1] = n - 1;
         init(arr, n-1);
     }
}
Explanation:
Create a method called init that takes two parameters, an array and the number of elements in the array
When n reaches 0, set the first element to 0 (This is a base for our recursive method)
Otherwise, set the element in index i to i
Call the init inside the init, this is the recursion part, with same array but decrease the number of elements by 1 (We decrease the number of element by 1 in each time so that it goes through all the elements in the array)