$child*$childPrice不對? 乘1/3 算起來是小數(shù)

<?php

$manprice=5;
$womanprice=3;

for($man=1;$man<20;$man++){
	for($woman=1;$woman<33;$woman++){
		for($child=1;$child<100;$child++){
			if(($man*$manprice+$woman*$womanprice+$child/3)?===?100?&&?($man+$woman+$child)===100){
				echo?'公雞'.$man.'只<br>';
				echo?'母雞'.$woman.'只<br>';
				echo?'小雞'.(100-$man-$woman).'只<br>';
				echo?'<hr>';
			}
		}		
	}
}