Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

How many triangles are there on the puzzle below?

Can you solve below mathematical equation?

2^1234 - 2^1233

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *