What English word has three consecutive double letters?

what does the below math rebus puzzle mean?

What does it mean?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

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?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

The more you take me, the more you leave me behind.
Who Am I?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?