What word is pronounced the same if you take away four of its five letters?

How many triangles are there in the picture below?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

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

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

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

I have feet, but no legs. Which animal Am I?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?