Quantitative Aptitude - Arithmetic Ability Questions

If xy = -18 and x2+ y2= 85, then find the value of (x + y).

If the successive discounts be 20% , 10% and 5% , then the single equivalent rate of discount is

An angle is smaller than its supplementary angle by 50°. What is the measure of the angle?

What is the value of 1/√2 Cot 30° + 1/√3 Cosec 60°?

The discount offered on a Shirt of Rs 500 and a pair of Trousers of Rs 1000 is 20% and 40% respectively. If Ajay bought 2 Shirt and 3 pair of Trousers then what was the effective discount ( in %) he recieved?

The first and last terms of an arithmetic progression are 23 and ­42. What is the sum of the series if it has 14 terms?

What should be the missing digit so that the number 347_547 becomes exactly divisible by 11?

If 1-aa3+9 = 19 - a1-a3, then what is the value of a?