Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

What is the word or phrase below?
R | E | A | D

Identify the 10 differences between the two given pictures.

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?