Quantitative Aptitude - Arithmetic Ability Questions

The sum of two positive integers is 34 and their difference is 8. Find their product.

The sum of numbers from 1 to 100 (inclusive of both) is

Out of three pipes the first two can fill an empty tank in 9 and 18 hours, respectively while the third can drain the filled tank in 15 hours. If all the three pipes are opened when the tank is empty, after how many hours will the tank be full?

In ΔPQR measure of angle Q is 90 deg. If cotP = 8/15, and PQ = 4cm, then what is the length (in cm) of side PR?

The perimeter of two similar triangles is 36 units and 48 units. Find the ratio of their corresponding areas.

Given w = -2, x = 3, y = 0 & z = -1/2. Find the value of (z/w) + x.

If X + Y = 19 and X - Y = 7, then XY = ?

25 - 1/2{5 + 4 - (3 + 2 - 1 + 3)} = ?