CREATE TABLE table_4224 ("Quartier" TEXT, "% 0-19 years" TEXT, "% 20-39 years" TEXT, "% 40-59 years" TEXT, "% 60-74 years" TEXT, "% 75 years and +" TEXT)

how many 20-39% are in pont-de-vivaux?
SELECT COUNT("% 20-39 years") FROM table_4224 WHERE "Quartier" = 'Pont-de-Vivaux'
SELECT COUNT("% 20-39 years") FROM "table_4224" WHERE "Quartier" = 'Pont-de-Vivaux'