Q:

What is the age of A in a group of 6 students – A, B, C, D, E and F whose average age is 16 years?
Statement I: Total age of B and D is 30 years
Statement II: Total age of E and F is 31 years.
Statement III: Total age of A is 10 years.

• 1
  Only I and II together are sufficient
• 2
  Only II and III together are sufficient
• 3
  Any two of the three are sufficient
• 4
  All three together are needed
• 5
  Even all together are not sufficient