Directions : What will come in the place of the question mark (?) in the following number series?

? , 8, 14, 34, 76, 148

Sum of 5 times of a fraction and 4 times its reciprocal is 9. What is fraction?

A, B and C gets a total wage of Rs.3600 if they work together. A and B gets a total wage of Rs. 2800 if they work together and A alone gets Rs.1600. Find the efficiency ratio of A, B and C  

A dishonest dealer marks up the price of an article by 15% and gave a discount of 20%. He also uses 900gm instead of 1000gm. Find his profit percent.

Naresh purchased a TV set for Rs. 11,250 after getting a discount of 10 % on the labeled price. He spent Rs. 150 on transport and Rs. 800 on installation. At what price should it be sold so that the profit earned would have been 15 % if no discount was offered? 

If the ratio of two numbers is 13 : 15 and their L.C.M. is 39780. Then the numbers are?

A cyclist cycles 8 km at 15 km/hr and a further 4 km at 20 km/hr. Find the average speed in km/hr. 

If a-b=1 and a³-b³=61, then the value of ab will be