Quantitative Aptitude - Arithmetic Ability Questions

I gain 19% if I sell an article for Rs. 595. What would be my gain or loss percentage if I sell it for Rs. 475?

Findout the odd word/letters/number/number pair from the given alternatives.
23 : 8 : : 62 : ?

A wholesaler sells a watch to a retailer at a profit of 8% and the retailer sells it to a customer at a profit of 12%. If the customer pays Rs. 8,448 what had it cost (approximately) to the wholesaler (in Rs)?

A vendor buys chikoos at 15 for Rs 8 and then sells at 10 for Rs 6. What will be the result?

Nirmit can do 2/3 of a job in 18 days. Kashish is twice as efficient as Nirmit. In how many days Kashish will complete the job?

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

If the selling price is tripled and cost price doubled the profit would become 65%. What is the present profit (in %)?

If 4(x+y) = 256 and (256)(x-y) = 4, then what is the value of x and y?