what does the below math rebus puzzle mean?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?