The answer is 75.
Let's look at your problem shall we:
Odd number: It should end with the numbers 1,3,5,7, and 9.
The number is less than 100: It should be from the number 1-99
Sum of digits: 12
Multiple of 15: 15, 30, 45, 60, 75, and 90.
We can rule out 30, 60, and 90 because they are even.
1+5 = 6; 4+5=9; 7+5 = 12
You are left with 75.
To solve this problem you must apply the proccedure shown below:
1- You must apply the following formula:
Where
is the residual, 
is the observed value 
and 
is the predicted value .
2- You only need to substitute the 
into the equation 
and then, you must apply the formula for calculate the residual:
The answer is: The residual is 
We have this following information
30-seconds ad = $146000
The manufacturer wants to use one slot of 30-second per segment
Total segment = 20 segment
Total campaign cost = 20×146000 = $2,920,000
