Answer: Kay made 8 phone calls Stephanie made 13 phone calls
Explanation: Assume the number of phone calls that Stephanie made is x. We are given that: Kay made 5 phone calls less than Stephanie. This means that: Kay made x-5 phone calls
We know that the total number of phones is 21. This means that: 21 = x + x - 5
Now we solve for x as follows: 21 = x + x - 5 21 = 2x - 5 2x = 26 x = 26/2 x = 13
This means that: Stephanie made x = 13 phone calls Kay made x - 5 = 13 - 5 = 8 phone calls