Answer
$5$ slices of pie
$7$ cups of orange juice
$2$ doughnuts
Work Step by Step
Each student gets:
1 slice of pie
1 cup of orange juice
2 doughnut holes
So for 11 students:
Pie slices: $11\times 1=11$
Orange juice cups: $11\times 1=11$
Doughnut holes: $11\times 2=22$
Caterer's supply:
Pie slices: $2\times 8=16$
Orange juice cups: $18$
Doughnut holes: $24$
Leftovers for the custodian:
Pie slices: $16-11=5$
Orange juice cups: $18-11=7$
Doughnut holes: $24-22=2$
