Josie received three times as many birthday cards on her birthday this year than last year. She also received 13 balloons for a total of 46 presents. The equation
3x+13-46 describes the situation. What does the variable in the equation represent?
The number of cards Josie received last year.
The number of cards Josie received this year,
The number of balloons Josie received last year,
The number of balloons Josie received this year.