How can you remove the last object in a MemC

my code was like this (for removing the balls, i just don't know if it's correct)

if( balls > 20)
{
balls.RemoveLast()
}

is this correct or not?

.elms() returns the total number of elements in the container. removeLast() is the best option for removing the last element.

if( balls.elms( ) > 20)
{
balls.removeLast();
}

thank you very much

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i knew that i've forgotten something!

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and how can you show the balls faster after a time (for example 10 sec.) so that the game becomes more difficult?

I'm not sure what you mean by the balls stuff, but you can make a timer by adding a float myTimer and add Time.d( ) each frame, and check if( myTimer > 10 ) { /*stuff*/ }.
There's a few different ways to do timers.