To express the relationship between the number of brownies sold (\( b \)) and the total sales from brownies (\( s \)), we can use the equation:
\[ s = 1.5b \]
This means that the total sales (\( s \)) is equal to the price per brownie ($1.50) multiplied by the number of brownies sold (\( b \)).
If the club sells 25 brownies, we can calculate the total sales:
\[ s = 1.5 \times 25 \] \[ s = 37.50 \]
So the answer is:
s = 1.5b; $37.50