If you want the html to actually have a <br> tag, then you could do something like this:
<?php
$date='July 16 2003';
$pies='5';
$apples='10';
$total=$pies + $apples;
echo 'the amount of food items we have are ';
echo $total."<br><br>";
echo 'the date is '.$date;
?>
If you also want it to have a new line when viewing the source code after the page has loaded, try this:
<?php
$date='July 16 2003';
$pies='5';
$apples='10';
$total=$pies + $apples;
echo 'the amount of food items we have are ';
echo $total."<br><br>\n\n";
echo 'the date is '.$date;
?>
Also notice I changed the last line of your code to remove the redundant echo's and instead used the concatenator.