We are given
The student council earned $1.25 for every cup of hot chocolate it sold
and $0.75 for every cup of apple cider it sold
total number of cup is 375
we have equation as
![x+y=375](https://img.qammunity.org/2019/formulas/mathematics/middle-school/heelnal4vahh6072icn05t1892keb7ep0d.png)
![1.25x+0.75y=393.75](https://img.qammunity.org/2019/formulas/mathematics/middle-school/bfk4ha2nwdczm89nmbru0x7m77vgp8ehjd.png)
The above equation is of total cost equation
We can see that first term is 1.25x
and we have
The student council earned $1.25 for every cup of hot chocolate
so, to find total cost of hot chocolate , we multiplied 1.25 with x
that's why
x must be the number of cups of hot chocolate sold
Hence,
option-C........Answer