Answer:
Kaitlin served 20 orders, Juan served 40 orders and Tony served 11 orders on Monday at the school cafeteria.
Explanation:
1. Let's review the information provided to us to answer the question correctly:
Total of orders server at the school cafeteria by Kaitlin, Tony and Juan = 71
Tony served 9 orders fewer than Kaitlin
Juan served 2 times as many orders as Kaitlin
2. How many orders did each one serve?
For answering this question, we should prepare and write down our equation this way:
x = Number of orders served by Kaitlin
2x = Number of order served by Juan ( 2 times as many orders as Kaitlin)
x - 9 = Number of order served by Tony (9 orders fewer than Kaitlin)
x + 2x + x - 9 = 71
4x = 71 + 9
4x = 80
x = 80/4 = 20
x = 20 ⇒ 2x = 40 ⇒ x - 9 = 11
Kaitlin served 20 orders, Juan served 40 orders and Tony served 11 orders on Monday at the school cafeteria.