Let's begin by listing out the information given to us:
Mariko & friend = $24.50
Their lunches cost the same amount: x + x = 2x
Discount Coupon = $4
The cost of each lunch is given by:
[tex]\begin{gathered} c(total)_{}_{}=24.50-4=21.50 \\ c(total)_{}=\text{\$}21.50 \\ The\text{ cost of each lunch is given by:} \\ \frac{c(total)_{}}{2}\Rightarrow\frac{21.50}{2}\Rightarrow10.75 \\ c=\text{ \$}10.75 \end{gathered}[/tex]
