php mysql question from a form

I have a form that people use to calculate their blood alcohol level. It currently does this with weight, sex and number of drinks. I want to add a multiplier that uses the type of drink to impact the BAC number since some drinks have more alcohol than others. The alcohol is selected in the form from a drop down iist.

So far I have created a separate table with a column called Drink and a column called Alcohol_Content. I am getting stuck tying the two queries together . Any help would be appreciated. Thanks!

Here is the code I have:

<?php require_once ('db-connect.php'); ?>
<?php
	$result = '';
	if(isset($_POST['Sex'])){
		$sex = mysql_real_escape_string ($_POST['Sex']);
		$weight = mysql_real_escape_string ($_POST['Weight']);
		$number = mysql_real_escape_string ($_POST['Number']);
		$hours = mysql_real_escape_string ($_POST['Hours']) * 0.015;
                $Drinktype = mysql_real_escape_string( $_POST['Drink'] );
                $Alcohol = mysql_real_escape_string( $_POST['Alcohol_Content'] );
       
		
		$query = "SELECT `".$number."` FROM ".$sex." WHERE body_weight <= '".$weight." lb.' ORDER BY body_weight DESC";
		$result = mysql_query($query);
		$row = mysql_fetch_array($result);

  $query = "SELECT `".$Alcohol."` FROM ".$Drinktype.";
    	$result = mysql_query($query);
		$row2 = mysql_fetch_array($result);

       
       		$result = $row[$number] - $hours * $row2;
                $result = 'Your Blood Alcohol Level is: '.$result.'%';
		
	}
?>