What is harder to catch the faster you run?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

What is full of holes but still holds water?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Can you make four (4) nines (9) equal 100?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Do you know who was buried in John's tomb?

Move three sticks of the spiral below to form a square.

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat