How many {material used} are to/by {fiber} ?
Fiber contains how many materials?
How many {material are used} for {fiber} ?
SELECT ( COUNT ( ?h ) AS ?b ) { ?h property:made_from_material resource:fibre }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P186> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q161 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P186 wd:Q161 }
62