10 year ago, the ages of A and B were in the ratio 13 :17 respectively. 17 year from now the respective ratio of their ages will be 10:11. what is the age of B at present?  

Everybody in a room shakes hands with everybody else. The total number of hand-shakes is 55. The total number of persons in the room is:

Mr. Duggal invested Rs. 20, 000 with rate of interest at 20 p.c.p.a. The interest was compounded half yearly for first year and in the next year it was compounded yearly. What will be the total interest earned at the end of two years? 

Percentage of decrease in the number of accidents from May to June is:

A 300-meter-long train moving with an average speed of 126 km/hr. crosses a platform in 24 seconds. A man crosses the same the same platforms in 5 minutes. What is the speed of man in meter/second?

If sinθ – cosθ = 7/13 and 0⁰ < θ < 90⁰ , then the value of sinθ + cosθ is :

Akshay has 30 articles, each having the same cost price. He marked the price of each article at 30% above its cost price. He sold 15 of the articles at a discount of 20% each, and the remaining 15 articles at a discount of 10% each, thereby gaining a total profit of ₹630. What was the cost price of each article?

A, B, C completes 37.5%, 44.44%, 66.66% of a work in 9 days, 8 days, 8 days respectively. Then find how many days they take to complete 65% of work together?