<human>:  While at the dollar store, Sloane counts 100 customers entering the store. The next day, she counts 50 more customers than the first day. If the total number of customers by the third day was 500, how many customers did she count on the third day?
<bot>: How many customers did she count on the second day? ** On the second day, she counted 100+50 = <<100+50=150>>150 customers.
How many customers did she count on the first two days? ** The total for the first two days is 150+100 = <<150+100=250>>250 customers.
How many customers did she count on the third day? ** If the total count for three days was 500, she counted 500-250 = <<500-250=250>>250 customers on the third day.
#### 250