CREATE TABLE table_29001 ("Electoral District" TEXT, "Registered voters" FLOAT, "Seats in Congress" FLOAT, "Candidates per party" FLOAT, "Participating parties" FLOAT, "Total candidates" FLOAT)

What is the number of total candidates when registered voters is 47742?
SELECT "Total candidates" FROM table_29001 WHERE "Registered voters" = '47742'
SELECT "Total candidates" FROM "table_29001" WHERE "Registered voters" = '47742'