What does this Rebus Picture mean?

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

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

How can you tell a raw egg from a hard-boiled egg?

A man dies of old age on his 25 birthday. How is this possible?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?