Question

Leila, Scott, and Chau served a total of 90 orders Monday at the school cafeteria. Leila served 10 more orders than Scott. Chau served 2 times as many orders as Scott. How many orders did they each serve?

Answer 1

L + S + C = 90
L = S + 10
C = 2S

S + 10 + S + 2S = 90
4S + 10 = 90
4S = 90 - 10
4S = 80
S = 80/4
S = 20 <=== Scott served 20

L = S + 10
L = 20 + 10
L = 30 <== Leila served 30

C = 2S
C = 2(20)
C = 40 <== Chau served 40