There is a minimum height restriction of 1.5 metres on some rides.  these are the heights of a group of friends. select any of the friends who cannot go on the ride. george - 1.6m ben 1.54 m hannah 1.7 m emily 1.49 m

George - 1.6m    1.6 m > 1.5 m, so George can go on the ride. 
ben 1.54 m         1.54> 1.5 m, so Ben can go too.
Hannah 1.7 m     1.7 m > 1.5 m, so Hannah can go.
Emily 1.49 m      1.49 m < 1.5 m, so Emily gets left behind.   ;(