*REPOST* HELP WITH QUESTION 3 (BRIANLIEST AND 50 POINTS) hint: question 1 and 2 is answered (NO LINKS) Amos scored 100 points while playing 3 rounds of a game.
Round 1 : 30 points
Round 2 : 25 points
Round 3 : ?
How many points did he score in round 3?
Complete the steps to solve the problem

1. What do you need to solve for in this problem? Choose a variable to represent this unknown value. Round 3 = x
x + 30 + 25 = 100

2. Using the variable you chose, write an equation to represent this situation. (Hint: You may want to put the number of points in each round on one side and the total number of points on the other.
30 + 25 = 55
x + 55 = 100
- 55 - 55

x = 45

3. Solve this equation to find how many points Amos scored in round 3. Show your work.