What should come in the place of Question marks (?) in the following series?

1) 5 / 1 , 3 / 4 , 10 / 2 , 6 / 8 , 20 / 4 , ?

As we can see that numerator and denominator are multiply by 2 so

2 term = 3* 2 / 4 * 2 =6 / 8 = 4 term

4 term = 6* 2 / 8 * 2 =12 / 16 = 6 term

? = 12 / 16

2) 35 , 70 , 91 , 182 , 227 , ? , 463 , 926

As we can see if we multiply first term with 2 then we get the second term and so on :

35 * 2 =70

91 * 2 =182

227 * 2 =454

463 * 2 =926

So ? = 454