Which is the rope you never skip with?

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

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What has many keys but can’t open a single lock?

What is the word or phrase?

Find the number of squares in the below picture

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?