Thomas = x
Huilan = x -15 (15 years younger than Thomas' age)
If Huilan (x) + Thomas' age (x-15) equals 33, then ;
x+x -15= 33
2x -15 =33 (do anything (throw -15 to the other side and then divide by 2) to leave x alone)
2x= 33+15
2x = 48
x = 24
Thomas is 24 and Huilan is 24-15 = 9 years old.
Hope it helps!
#MissionExam001
