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My code

// Update the _ to solve the problem
import java.util.*;

class Codechef
{
	public static void main (String[] args)
	{
	    int length = 11;
        int width = 13;
        System.out.println(length * width);
        System.out.println(2 * (length + width));
        width = 15; 
        System.out.println(length * width);
        System.out.println(2 * (length + width));
	}
}

Learning course: Learn Java
Problem Link: CodeChef: Practical coding for everyone