If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Count the number of triangles in the given picture.

When it is alive we sing, when it is dead we clap our hands. What is it?

Find the missing number in the sequence below:

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

What is the centre of gravity?

Replace the question mark with the correct number in the below-given picture?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Find out the number of circles in the given picture having Illusion