Answer:
Jerry is 90, Marty 45 and Phil is 50
A liner graph shows the answer
Current age = x
4/5x>3/4(x+1)
4/5x>3/4x+3/4
16/20x>15/20x+3/4
1/20x>3/4
Multiple each side by 20
x>3/4*20
x>60/4
x>15
The smallest age you could be is 16
Hope this helps :)
In a 30 60 90 triangle, the "middle-sized" side = the short side multiplied by the square root of 3.
so the "middle-sized" side = x * square root of 3.
Source:
http://www.1728.org/trig2.htm
