noes query
// WP_Query arguments
$args = array(
'post_parent' => '$post->ID',
'post_type' => array( 'page' ),
'post_status' => array( 'publish' ),
'has_password' => false,
'nopaging' => true,
'posts_per_page' => '-1',
'order' => 'DESC',
'orderby' => 'title',
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'area',
'value' => '$area',
'compare' => '=',
),
array(
'key' => 'volumen',
'value' => '$vol',
'compare' => '=',
),
array(
'key' => 'tipos',
'value' => '$tip',
'compare' => '=',
),
array(
'key' => 'modalidad',
'value' => '$mod',
'compare' => '=',
),
array(
'key' => 'audiencia',
'value' => '$aud',
'compare' => '=',
),
),
);
// The Query
$list_pages = new WP_Query( $args );