What is the next number in the series?

15 29 56 108 208 ?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Count the squares in the matchstick puzzle below?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?