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frika
The ratio up to forward is 2:5 (For every two feet the ramp goes up it also goes 5 feet forward). 

If this ratio remained constant and we went x feet up and  22.5 feet forward, then x:22.5=2:5,

5x=2·22.5,

5x=45,
x=45÷5,
x=9.
Answer: 9 feet up