I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

When is the top of a mountain similar to a savings account?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

Can you count the number of triangles in the picture below?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

Can you start the fire using two pieces of wood?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.