CREATE TABLE table_29615165_5 (_percentage_40_59_years VARCHAR2, quartier VARCHAR2)

the quartier menpenti has how many 40-59 year olds?
SELECT _percentage_40_59_years FROM table_29615165_5 WHERE quartier = "Menpenti"
SELECT "_percentage_40_59_years" FROM "table_29615165_5" WHERE "Menpenti" = "quartier"