Data from both ordinary and DEPT l3C NMR spectra for several compounds with the formula C5H10 are

Question:

Data from both ordinary and DEPT l3C NMR spectra for several compounds with the formula C5H10 are given here. Deduce a structure for each compound,
(a) 25.3 (CH2);
(b) 13.3 (CH3), 17.1 (CH3), 25.5 (CH3), 118.7 (CH), 131.7 (Cqualernaiy)
(c) 12.0 (CH3), 13.8 (CH3), 20.3 (CH2), 122.8 (CH), 132.4 (CH).