Which of these could be solved by using the sentence 'A - 5'?

• A.  ishan is 5 times as old as Sanjit. If A is Sanjit's  age in years, how old is. Ishan?
• B.  Tarun is 5 years younger than Anny. If A is Anny's age in years, how old is Tarun?
• C.  Naman is one-fifth as old as Aman, If A is Naman's age, how old Is Aman?
• D.  Geet is 5 years older than Suhana. If A is Suhana's age in years, how old is Geet?