Answer:
Nina's steakhouse sold approximately 247 steaks that night.
Explanation:
In order to calculate the number of steaks Nina's sold that night we can apply a rule of three, in a way that 34% is related to 84 steaks in the same proportion as 100% is related to "x" steaks. We have:
100% -> x steaks
34% -> 84 steaks
100/34 = x/84
34*x = 100*84
x = 100*84/34
x = 247.0588 steaks
Nina's steakhouse sold approximately 247 steaks that night.