The table below show the customers an arcade had leading up to the weekend.
Day | Customers |
Tuesday | 170 |
Wednesday | 176 |
Thursday | 139 |
Friday | 157 |
| 642 |
Over the weekend they had 9 times as many customers as they did before in the previous 4 days. How many fewer customers they have in the previous 4 days than they had over the weekend?