6840 customers ... 45 days
x customers = ? ... 1 day
If you would like to know how many customers were in Jasigreen's class in 1 day, you can calculate this using the following steps:
6840 * 1 = 45 * x
6840 = 45 * x /45
x = 6840 / 45
x = 152 customers
The correct result would be 152 customers.