Quantitative Aptitude - Arithmetic Ability Questions

If (1/x) + (1/y) + (1/z) = 0 and x + y + z = 9, then what is the value of x3 + y3 + z3 – 3xyz?

A retailer marks up his goods by 150% and offers 40% discount. What will be the selling price (in Rs) if the cost price is Rs 800?

The selling price of an article is Rs 816 if the discount on it is 15%. What would be the selling price of the article (in Rs) if the discount on it is 25%?

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is

Two spheres of equal radius are taken out by cutting from a solid cube of side (12 + 4√3) cm. What is the maximum volume (in cm3) of each sphere?

The length of the diagonal of a square is 12 cm. Find its area (in cm2).

What is the value of [cos (90 + A)÷sec (270 – A)] + [sin (270 + A)÷cosec (630 – A)]?

Kamal has some apples. He sold 40% more than he ate. If he sold 70 apples, how many did he eat?