What you cannot hold but it is yours?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I am white when I am dirty, and black when I am clean. What am I?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?