I think it is pretty simple.
I got the reference from here: https://www.advancedcustomfields.com/resources/query-posts-custom-fields/
$findNumber = 150;
$args = array(
'posts_per_page' => -1,
'post_type' => 'photos-videos',
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'max_number',
'value' => $findNumber,
'type' => 'NUMERIC',
'compare' => '>='
),
array(
'key' => 'min_number',
'value' => $findNumber,
'type' => 'NUMERIC',
'compare' => '<='
)
)
);
// query
$the_query = new WP_Query( $args );
Make sense?