Quantitative Aptitude - Arithmetic Ability Questions

Calculate the simple interest if Rs. 1800 is invested for 10 years at a rate of 5% per annum.

If in a two digit number, the digit at unit place is y and the digit at tens place is 5, then the number is

If -3[1-(x/2)] + 5x/3 = 1/6, then what is the value of x?

The length of one side and the diagonal of a rectangle are 7 cm and 25 cm respectively. Find its area (in cm²)

X attempts 94 questions and gets 141 marks. If for every correct answer 4 marks is given, and for every wrong answer 1 mark is deducted, then the number of questions wrongly answered by X is __.

A businessman imported Laptops, worth Rs 210000, Mobile phones worth Rs 100000 and Television sets worth Rs 150000. He had to pay 10% duty on laptops, 8% on Phones and 5% on Television sets as a special case. How much total duty (in Rupees) he had to pay on all items as per above details?

The height of a tower is 50√3 m. The angle of elevation of a tower from a distance 50 m from its feet is

cos(A+B) + cos(A-B) is equal to