What English word has three consecutive double letters?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

What demands an answer, but asks no questions

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

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

Can you write down eight eights so that they add up to one thousand?

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

Can you convert the number zero(0) into a positive number using just one mathematical operator ?