How is the moon similar to a dollar?

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

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Find the missing number in the sequence below:

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

In the image below, can you find the value of an angle(y)