Write a real-life problem using the expression

X-13>20

Mark spent 13 dollars on supplies for the dance. His goal is to make 20 dollars. How much worth of tickets does he need to sell to make his goal.

Step-by-step explanation:

To find this, we know we need to subtract 13 from something, in this case ticket sales. That number must be larger than 20, which in this case is the profits.