Problem $4[20$ marks$]$

Two objects attract each other gravitationally with a force of $4\mathrm{.}81{10}^{-10}N$ when they are $0\mathrm{.}400$ m apart. Their total mass is $3\mathrm{.}00$ kg $.$ Find their individual masses.

$G=6\mathrm{.}67{10}^{-11}N*m^{2\frac{?}{kg}}$