Let x be the number of brownies which are having by Anna.
\The number of brownies of Sarah is the half of the browns of Anna or
.
The number of brownies of Rob is the third of the browns of Sarah or
.
The number of brownies of Trina is the fourth of the browns of Rob or
.
But Trina has 3 brownies, therefore
.
Multiply each side by 24.
\
.
The number of brownies of Anna
.
The option H is correct answer.