If Sally is 3 years older than Bob and Bob is 4 times older than Steve, if we know Steve's age is the third prime number in the Natural numbers, how old is Sally?
Sally is 26.
Bob is 40. 
Steve is 24.
The third prime number is 23. 

So,
3 Years older than Bob is 41 - (40 / 2) = 31 Years old
4 Times Older than Steve is 52 - 16 = 36 Years old
Sally is 26 + 31 = 57 Years old