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Answer:
180 hamburgers
Step-by-step explanation:
This is a system of equations :)
Let's assume
x=# of hotdogs
y=# of hamburgers
x+y=300
2x+3y=780
2(x+y)=2*300
2x+3y=780
2x+2y=600
2x+3y=780
(2x+3y)-(2x+2y)=780-600
y=180 hamburgers
Hope this helps :D