Question 1168745
d, sherry daughter
m, mother


{{{system(d=m/2,d-12=(1/3)(m-12))}}}


{{{system(m=2d,3d-36=m-12)}}}


{{{3d-m=36-12=24}}}


substitute:
{{{3d-2d=24}}}

{{{highlight(d=24)}}}--------Sherry, the daughter


{{{highlight(m=48)}}}-------Mother