Count the number of lines in the image below ?

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 ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

It is always ahead of me yet I can never see it. What is it?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?