a water resevoir rose 7 feet above normal later fell two and half how far above or below normal was it then?

Question

the water in Avon reservoir rose 7 feet above normal. later it fell 2 and a half feet. how far above or below normal was it then?

Answer 1

7 - 2 and 1/2 = 7 - 5/2 = 14/2 - 5/2 = 9/2 = 4 and 1/2