For the following questions answer them individually
A person buys 15 pens for ₹100, and sells them at 13 pens for ₹100. What is the gain percentage?
A deposited a total of Rs.25,500 in a bank in the names of his grandsons P and Q who are presently 13 years and 14 years old, respectively. He divided his money in such a way that they get equal amounts upon attaining the age of 25 years. If the bank gives interest at a rate of 4% p.a. compounded annually, then how much has been deposited in Q’s name?
20 women can finish a piece of work in 16 days and 16 men can finish it in 15 days. What is the ratio of the working efficiency of a man and a woman?
If the difference between the compound interest, compounding annually and the simple interest on a certain sum of money at 5% per annum for 3 years is Rs.183, then what is the sum of money invested?
P and Q together can complete a work in 21 days. Q alone can complete it in 84 days. If efficiency of Q becomes double, then in how many days approximately will P and Q together complete the work?
A shopkeeper buys some fruits at a discount of 10% on the marked price. For selling the item he increases the marked price. If he wants to get a profit of 25% after allowing a discount of 15%, then by what percentage should his marked price be greater than the original marked price? (Correct to a nearest whole number)
The average age of a certain number of students in a college club is 20 years. Later, 27 new students, whose average age is 22 years, joined the club. 12 students, whose average age is 19 years, left the club. As a result of this change, the average age of all the students increases by 2 years. What is the present number of students in the club?
The speed of a boat along and against the current are 16 km/h and 12 km/h, respectively. The speed of the current is: