2x + 1
You can find that by switching the signs in the second set of parenthesis and then adding.
Answer:

Step-by-step explanation:
What you would have to do is take the 18 and double it because 50% doubled is 100% so when you double 18 it is 36
1st angle = 2 * 2nd angle
3rd angle = 2nd angle + 80
1st angle = 2x
2nd angle = x
3rd angle = 80 + x
2x + x + 80 + x = 180
4x = 100
x = 25
1st angle = 50
2nd angle = 25
3rd angle = 105
Answer:
<h2>The option B and D are the equations.</h2>
Step-by-step explanation:
Let, the total number of students are x.
The number of students having the ticket is
.
It is given that the number is 20.
Hence,
.
Option B is the equation.
Option D is also the same.
The difference is just, the variable is wriiten in the other side.