b
a and d should not be considered bc it is not logically correct. c is eliminated because that may not always be the case. therefore it should be b.
Answer:
online customers: slot 5
Walk in customers: slot 3
Step-by-step explanation:
x=2
5x +(3-1) =12
5x +2 =12
5x =12-2
5x =10
x =10÷5
x =2