Which metals in each of the following sets will have equal density?

Check all that apply.

$1-20\mathrm{.}2$ g gold placed in $21\mathrm{.}6$ mL of water and $12\mathrm{.}0$ g copper placed in $21\mathrm{.}6$ mL of water.

$2-11\mathrm{.}2$ g gold placed in $21\mathrm{.}6$ mL of water and $14\mathrm{.}9$ g gold placed in $23\mathrm{.}4$ mL of water.

$3-20\mathrm{.}2$ g silver placed in $21\mathrm{.}6$ mL of water and $12\mathrm{.}0$ g silver placed in $21\mathrm{.}6$ mL of water.

$4-20\mathrm{.}2$ g silver placed in $21\mathrm{.}6$ mL of water and $20\mathrm{.}2$ g copper placed in $21\mathrm{.}6$ mL of water.

$5-15\mathrm{.}2$ g copper placed in $21\mathrm{.}6$ mL of water and $50\mathrm{.}0$ g copper placed in $23\mathrm{.}4$ mL of water.

$6-15\mathrm{.}4$ g gold placed in $20\mathrm{.}0$ mL of water and $15\mathrm{.}7$ g silver placed in $20\mathrm{.}0$ mL of water.