I suspect you're trying to ask "What is the greatest common factor of 48 and 30 ?",
but I can't be sure.
-- The factors of 48 alone are 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48.
-- The factors of 30 alone are 1, 2, 3, 5, 6, 10, 15, and 30.
-- The common factors of 48 and 30 are 1, 2, 3, and 6.
-- Their greatest common factor of 48 and 30 is 6 .
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