The present ages of Aman, Bina and Charu satisfy the following conditions:
• Four years ago, the sum of their ages was 56 years.
• Six years from now, Aman will be twice as old as Bina was four years ago.
• Charu is three years younger than Aman.
(i) Form three linear equations in the present ages of Aman, Bina and Charu.
(ii) Express the system obtained in part (i) in matrix form.
(iii) Find their present ages.