55% of 32 oz is
55% *OF* 32
(of technically means multiplication in math)
so 55% * 32
55% is 0.55 in decimal form
SO 0.55 * 32 = 17.6
now that is what the someone drank we need to find was is left
32 - 17.6 = 14.4
There is still 14.4 oz left of water in the glass
Hope this helps :)