Question 1071632
So your profit would be,
{{{P[1]=-35+1.5*C}}}
and your brother's profit would be,
{{{P[2]=-20+1*C}}}
So then,
{{{P[1]=P[2]}}}
{{{-35+1.5C=-20+C}}}
{{{0.5C=15}}}
{{{C=30}}}
30 cups