The expression for how much each person owes is [tex]\frac{21}{3}[/tex].
Cost of pizza [tex]=[/tex] $[tex]15[/tex].
Cost of salad [tex]=[/tex] $[tex]6[/tex].
Total cost [tex]= 15+6 = 21[/tex].
Total friends [tex]= 3[/tex].
To find the expression for how much each person owes, divide total cost by number of friends.
So, the expression is [tex]\frac{21}{3}[/tex].
And, the share of each friend is $[tex]7[/tex].
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