Relative peak areas and proton counting

The area of each resonance is proportional to the number of hydrogen atoms. The vertical distances of the stair steps shown is a measure those areas. The ratio of peak heights, represented by the green arrows, 3 2, corresponds to the three hydrogen atoms bonded to C-3 and the two hydrogens bonded to C-1 in 1,2,2- trichloropropane. 

What are the relative integrate areas of the absorptions of each of the following compounds (a) 1,2-dichloro-2-methylpropane (b) l-bromo-2,2-dimethylpropane 

Which of the following isomers can be distinguished from the others solely on the basis of the number of NMR absorptions and their intensities  

---