What will come in place of the question mark (?) in each of the following series?

15     ?    24    33     97    122     

1-[5-{2+(-5+6-2)2}] is equal to 

If A alone take 4 days more than A and B worked together. If B alone take 16 days more than A and B together. How many days they take together? 

The average of a collection of 20 measurements was calculated to be 56 cm . But later it was found that a mistake had occurred in one of the measurements which was recorded as 64 cm, but should have been 61 cm. The correct average must be: 

What will be the greatest common factor of 96, 528, 2160, 3520?

If the clock is at 3:17, what time will be seen in the mirror?

A man earns a profit of 60% when he sells an article at 4/3 of the original selling price. Find the percent profit he makes at original price.

A starts a business with ₹75,000 and B joins the business 5 months later with an investment of ₹80,000. After 1 year, they earn a profit of ₹4,08,800. Find the share of A and B (in ₹).