What should come in place of the question mark '?' in the following number series?

17, 35, 106, ?, 2126

The respective ratio between the present ages of Rani and Moni is 6 : 7. If Moni is 4 years older than Rani, then what will be the respective ratio of the ages of Rani and Moni after 4 years? 

A shopkeeper wants to make a profit of 20% on an article after selling it, while he gives a cash discount of 20%. Further allows 4 more articles for free after purchase of one dozen articles to his premium customer. How much per cent above the cost price he must mark his article?

R, S and T started a business by investing Rs. 25000, Rs. 15000 and Rs.30000 respectively. If the total profit earned is Rs. 58800 and it is decided that one-third of the profit will be divided into their investment ratio and rest of the amount will be invested in another work, then what is the share of T?

The speed of train A and train B is 93 km/hr and 51 km/hr, respectively. When both the trains are running in the opposite direction, they cross each other in 18 seconds. The length of train B is half of the length of train A. If train A crosses a bridge in 42 seconds, then find the length of the bridge.

A shopkeeper purchased two types of wheat costing Rs. 220 per kg and Rs. 300 per kg. In what ratio should he mix the wheat so that he could sell the mixture at the rate of Rs. 360 per kg in order to earn the profit of 25%?

What should come in place of the question mark '?' in the following number series?

7, 13, ?, 49, 97, 193

What should come in place of the question mark '?' in the following number series?

9, 19, 40, 83, ?, 345, 696