Using a variable multiple times in LESS

One variable can be used multiple times:

@var: 20px;

p {
	font-size: @var;
}
div {
	font-size: @var;
}

The result of compiling the above code will be as follows:

p {
	font-size: 20px;
}
div {
	font-size: 20px;
}

Tell me what the result of compiling the following code will be:

@var: 100px;

#block {
	width: @var;
	height: @var;
}

Tell me what the result of compiling the following code will be:

@color: #000;

p {
	color: @color;
}
div {
	background-color: @color;
}
section {
	border: 1px solid @color;
}