A and B started a business with investments Rs 3500 and Rs 2500 respectively. After 4 months C joined with Rs 6000. If the difference between C's share and B's share in the annual profit was Rs 1977, what was the total annual profit? 

Direction (66-70): What should come in place of the question mark(?) in the following number series?

4, 5, 14, 51, ?

Ravi purchases 90 pens and sells 40 pens at a gain of 10% and 50 pens at a gain of 20%. Had he sold all of them at a uniform profit of 15% he would have got Rs. 40 less. Find the cost price of each pen.

In the given figure, AB, AE, EF, FG and GB are semicircles. AB=56 cm and AE=EF=FG=GB. What is the area (in cm²) of the shaded region?

Directions: Each of the questions consists of a question followed by three statements. You have to study the questions and the statements and decide which of the statements(s) is/are necessary to answer the question. 

What is the area of the hall?
 I. Material cost of flooring per sq. meter is Rs. 250
 II. labor cost of flooring the hall is Rs. 3,500
 III. Total cost of flooring the hall is Rs. 14,500

The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years the average of the family at the birth of the youngest member was -

Ratio of the principal and the amount after 5 year is 10:12. Then the rate of interest per annum is