Answer:
27 people
Step-by-step explanation:
Out of 10 people, 7 people ordered a hot dog.
Multiply both sides by 9:
Out of 90 people, [tex]7\times9[/tex] people ordered a hot dog.
Thus, 63 people ordered a hot dog.
Number of people who did not order a hot dog: [tex]90-63=27[/tex]
