Plz help asap with part a and b

well I’m only I 6th grade but I will try

Step-by-step explanation:

A.let’s start with 4=20 which we know could go down to 3=15 which could also go down even more.

B. Your have 4 days and 20 phone calls 5 days would be 25 phone calls and 6 days would be 30 phone call. So a week would be 35 phone calls.

every 5 customers that walk in, only 2 buy popcorn.

step-by-step explanation:

basically 2/5.

brainliest would be appreciated.