What is common among 11, 69, and 88?

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

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?

Can you Find and name the hidden bird in the picture below ?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Can you count the number of triangles inside a triangle?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What demands an answer, but asks no questions

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

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