Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What has a ring but no finger?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Why do we preferably have round manhole covers and not square ones?

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?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?