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

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

Our product and our sum always give the same answer. Who are we?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Replace the question mark with the correct number in below Picture:

Find the number of squares in the below-given picture.