Quantitative Aptitude - Arithmetic Ability Questions

The marked price of a pen is Rs 3000. The shopkeeper gives two successive discounts of 15% and a% to the customer. If the customer pays Rs 2142 for the pen, then what is the value (in percentage) of a?

If x=2+3,then the value of x2-x+1x2+x+1 is

There is 40% increase in an amount in 8 years at simple interest. What will be the compound interest (in rupees) of Rs 30000 after 2 years at the same rate?

A telephone bill costs Rs.13 for 19 minutes. What is the cost in rupees for 15 minutes 50 seconds?(rounded to one decimal)

If ax + by = 1 and bx + ay = 2aba2+b2 then x2+y2a2+b2 is equal to

The list price of an article is Rs. 900. It is available at two successive discounts of 20% and 10% . The selling price of the article is:

Two students appeared for an examination. One of them secured 16 marks more than the other and his marks were 75% of the sum of their marks. The marks obtained by them are

If 3+12=x+3y, then the x+y is