What must $y$y be equal to so that $6\times y=12$6×y=12 is true?

What must $j$j be equal to so that $6\times j=30$6×j=30 is true?

What must $k$k be equal to so that $4\times k=24$4×k=24 is true?

What must $r$r be equal to so that $9\times r=63$9×r=63 is true?