Answer:
15
Step-by-step explanation:
If 10 oz. box costs $3.50 and a 16 oz. box costs $5.00 and she collected $97.50 we can represent an expression that relates for how many money Jillian made:
\(3.5*x+5*y=97.50\) (1)
where x is the number of 10 oz. boxes and y is the number of 16 oz. boxes.
She sold 24 boxes therefore:
\(x+y=24\) (2)
We can right equation in terms of y and substitute it into equation 1:
\(y=24-x\) (2)
\(3.5*x+5*(24-x)=97.50\)
Solve for x:
\(x=15\)
Jillian sold 15 10oz. boxes
