280 = 20x + 100
20 * 9 = 180
x = 9
Check you answer :
280 = 20 ( 9 ) + 100
280 = 180 + 100
280 = 280 . True statement
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Answer:
See below
Step-by-step explanation:

Answer:
well i just know its 9 out of 27
Step-by-step explanation:
Answer & Step-by-step explanation:
First, we will multiply 5 by 28 to find out the total number of ages in the room.
5 * 28 = 140
Now, we will multiply 6 by 29 to find out the total number of ages in the room after the new person comes in.
6 * 29 = 174
Now, in order for us to find the age of the new person, then we will subtract 140 from 174.
174 - 140 = 34
So, the person that entered the room is 34 years old.