How many {package management system} are for {Android} ?
How many package management systems does Android have?
How many package management systems exist for Android?
SELECT ( COUNT ( ?t ) AS ?v ) { resource:Android property:package_management_system ?t }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q94> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3033> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q94 wdt:P3033 ?obj }
5