Insert The Missing Number - Puzzle

Insert the missing number:

3 6 7

5 8 9

4 7 ?

Before you go for the answer please comment your answer!

Answer:

8

How Many Years Older is C To D?? - Puzzle

A is 3 years older to B and 3 years younger to C,
while B and D are twins.

How many years older is C to D..??

a)3
b)6
c)4
d)9

Before you go for the answer please comment your answer!

Answer:

b)6