First figure out how many total speeding tickets the two people got by adding the 6 speeding tickets Sarah got to the equal number (6) that Mark got: 6 + 6 = <<6+6=12>>12
Now subtract the combined number of speeding tickets from the total number of tickets to find the combined number of parking tickets: 24 - 12 = <<24-12=12>>12
Now express Mark's number of parking tickets in terms of the number of parking tickets Sarah got: m = <<2=2>>2s
We know that m + s = 12, so substitute in the value of m from the previous step to get 2s + s = 12
Combine like terms to get 3s = 12
Divide both sides of the equation to get s = <<4=4>>4
Now multiply the number of parking tickets Sarah got by 2 to find the number Mark got: 4 * 2 = <<4*2=8>>8
#### 8