Complete the table series riddle by finding the number that can replace "??".

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

Can you solve this picture maths equation?

Why is Saturday stronger than Monday?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

What does the below rebus riddle means?

Find the Goldfish below the given Image.