In a year,

Seema earns = Rs. 1,50,000

Seema saves = Rs. 50,000

Money spend = 1,50,000 - 50, 000 = 1,00,000

(a) 

Money that Seema earns : the money she saves = 1,50,000 : 50,000 = $\frac{150000}{50000}=\frac{15}{5}=\frac{3}{1}$ = 3:1

Money that Seema earns : the money she saves =  3:1

(b) 

Money that she saves : the money she spends = 50,000 : 1,00,000 = $\frac{50000}{100000} =\frac{1}{2}$ = 1:2

Money that she saves : the money she spends = 1:2