Answer: Age of Lin is 12
Solution:
Let X= age of Maya
(X/2)+4= age of Adrian
((X/2)+4)-7= age of Lin
X+(X/2)+4+((X/2)+4-7)=61
X+.5X+4+.5X+4-7=61
2X+4+4-7=61
2x=61-8+7
2X=60
X=30 age of Maya
19= age of Adrian
Age of Lin is
=((X/2)+4)-7
=15+4-7
=12
To check if this is correct
30+19+12=61
