Answer: gregg is 7, timothy is 14, Aunt Marty is 28
Explanation:
lets named them first
timothy is t
Gregg is g
Marty is m
what do we know?
t=2g (twice as old)
m=4g, (4 times old as Gregg)
the sum of their ages is 49
2g(which is timothy)+4g(which is Marty the aunt) +g (gregg)=49
7g=49
gregg is 49/7=7
Timothy is twice his age 7*2=14
Marty is 4 times as gregg
4*7=28
if you add them, it will be 49