What can you catch but never throw?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Can it be possible to build a house that has all its four walls facing towards the South?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Decode below rebus
D
N
A
T
S , D

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

What time is it when an elephant sits on a fence?