CREATE TABLE table_203_70 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

what is the difference between france 's and egypt 's silver medals ?
SELECT (SELECT "silver" FROM table_203_70 WHERE "nation" = 'france') - (SELECT "silver" FROM table_203_70 WHERE "nation" = 'egypt')
SELECT (SELECT "silver" FROM "table_203_70" WHERE "nation" = 'france') - (SELECT "silver" FROM "table_203_70" WHERE "nation" = 'egypt')