Question

Which of the following systems of equations can be used to find a, the number of adults attending, and s, the number of students attending the game?

Answer 1

The problem can be expressed in the following system of linear equations:

A total of 120 adults (a) and students (s) attended a school:

a + s = 120

Each adult paid $2.50, mathematically, that is 2.5a

Each student paid $1, mathematically, that is 1s

and the total paid by adults and students attending the game was $189

then, we have:

2.5a + 1s = 189

then, we can conclude that the problem can be expressed as follows:

a + s = 120

2.5a + 1s = 189

or equivalently:

a + s = 120

2.5a + s = 189

so, the correct answer is D.