What adds to 12 but multiplies to 9

How do i do this activity, is appreciated

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]