Acceleration is the answer
Four children average is 15.25 so ages must add to 61
61-12-16=33
11 and 22 go into 33
Youngest is 11
1. added four to both sides
2. divided both sides by two
3x - 17 = 9x + 7
Rearrange on same sides
-17 - 7 = 9x - 3x
-24 = 6x
Divide by 6 on either sides to isolate 6

6 and 6 cancels out
-4 = x
Answer is:
B. x = -4
Answer:
As a fraction it must be 1/3