Quantitative Aptitude - Arithmetic Ability Questions

If a boat goes upstream at a speed of 18 km/hr and comes back the same distance at 30 km/hr. What is the average speed (in km/hr) for the total journey?

Deepak found that he had made a loss of 10% while selling his smartphone. He also found that had he sold it for ` 50more, he would have made a profit of 5%. The initial loss was what percentage of the profit earned, had he sold the smartphone for a 5% profit ?

Mr. Kiran sold a bus for Rs. 18700 at a loss of 15%. At what price should the bus be sold to get a profit of 15%?

If 6 years are subtracted from the present age of Ayush and takes 25% of that then we get the present age of his only son. 4 years ago, his daughter’s age is 7 years more than his son. Sum of daughter’s present age and his wife’s present age is 10 years more than Ayush’s present age then find the present age of Ayush if average of present age of entire family is 30.25 yr? 

A person bought pens at 25 for a rupee and sold at 15 for a rupee. What is his profit percentage?

Seven years from now Virat will be twice as old as Mohinder. Five years ago Mohinder's age was one year less than 2/5 of Virat's age. What is Virat's present age?

What is the HCF of 6345 and 2160?

A trader had 960 kgs of rice. He sold a part of it at 20% profit and the rest at 8% profit, so that he made a total profit of 12%. How much rice (in kgs) did he sell at 8% profit?