Students sold 400 tickets to the spring band concert. The students sold adult and child (under 12 years old) tickets. Each adult ticket was $5.00 and each child ticket was $2.00. The total amount of money earned from the sale of tickets was $1475

You will have a system of equations.

Let's say that the number of adult tickets sold is x. The number of child ticket sold is y.

We know that they sold 400 tickets, so: x + y = 400

We also know that they earned $1475

An adult ticket is $5 and a child ticket is $2, so: x * 5 + y * 2 = 1475

Because x + y = 400, we know that y = 400 - x. We use this in the main equation instead of the variable y:

x * 5 + (400-x) * 2 = 1475

5x + 800 - 2x = 1475

3x + 800 = 1475

3x = 675

x = 225

Because x + y = 400, we can calculate that y = 175

They sold 225 adult tickets and 175 child tickets.