Prove that the below maths equation is true.

8 + 8 = 91

You can hear me, but you can't touch or see me.

What am I?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

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.

Why Wine Glass Stem is so long?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

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?