Based on the calculations, the unknown number is equal to 
- Let the unknown number be x.
<h3>How to find an
unknown number:</h3>
Translate the word problem into an algebraic expression, we have;
Adding 21 to the unknown number:

Multiplying the result by 3:

84 more than two-thirds of the unknown number:

Equating the equations, we have:

Cross-multiplying, we have:

Read more on word problems here: brainly.com/question/13170908
816/850x100 = 96
Therefore 96 % of tickets were sold.
S - 4
s minus 4 is the answer. s is the number and this is 4 fewer than s. Hope this helps.
You could have stayed in one place
I think