If two's company, and three's a crowd, then whats four and five ?

Be active and find the killer in the picture Riddle below.

What am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

I am the fastest animal but cannot climb the tree. What am I?

You need to arrange three 7 and mathematical symbols to form number 1?

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.

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10