Kira, Rafael, and Eric served a total of 89 orders Monday at the school cafeteria. Rafael served 9 more orders than Kira. Eric served 3 times as many orders as Kira. How many orders did they each serve?
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Kira = x
Rafael = y
Eric = z
ATP,
x + y = 9 (i).. Y = 9 - x
3x = z (ii)
x + y + z = 89 (iii)
In iii,
x + 9 - x + 3x = 89
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