First, you would need to determine how many customers ordered dessert.
70 - 21 = 49
Next, you would need to create an equation for this problem. Let x represent the unknown percentage.
[tex] \frac{49}{70} [/tex] = [tex] \frac{x}{100} [/tex]
Cross multiply.
70x = 4,900
Now, all you would need to do is isolate the x. To do this, you would divide both sides by 70.
x = 70
x = 70%
So, 70% of the customers ordered dessert.
I hope this helps!
