When can we add 2 to 11 and get 1 as the correct answer?

The more of this there is, the less you see. What is it?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

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?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Readers with excellent focus can find three differences between the camping scene pictures in 16 seconds. Can you? Test your eye power now!

What word begins and ends with an E, but has only one letter?

If it took eight men ten hours to build a wall, how long would it take four men to build it?