How many triangles are there on the puzzle below?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

I know a nine-letter word having only one vowel.
Do you ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What is always in front of you but can’t be seen?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.