why number 8549176320 is one of a kind?

Find the value of "a" by solving the maths equation in the picture below:

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?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

Can you find out the number of the parking space in which the car is parked?