CREATE TABLE table_4225 ("Quartier" TEXT, "% 0-19 years" TEXT, "% 20-39 years" TEXT, "% 40-59 years" TEXT, "% 60-74 years" TEXT, "% 75 years and +" TEXT)

the quartier menpenti has how many 40-59 year olds?
SELECT "% 40-59 years" FROM table_4225 WHERE "Quartier" = 'Menpenti'
SELECT "% 40-59 years" FROM "table_4225" WHERE "Quartier" = 'Menpenti'