A. No, half of 48 would be 24, not 22.
B. no; 45% because
100%/x%=48/22
(100/x)*x=(48/22)*x    - we multiply both sides of the equation by x
100=2.18181818182*x    - we divide both sides of the equation by (2.18181818182) to get x
100/2.18181818182=xÂ
45.8333333333=xÂ
x=45.8333333333