Quantitative Aptitude - Arithmetic Ability Questions

A mason can build a wall in 70 hours. After 7 hours he takes a break. What fraction of the wall is yet to be built?

What is the average of all natural numbers from 21 to 39?

In what ratio should tea costing Rs 300/kg be mixed with tea costing Rs 200/kg so that the cost of the mixture is Rs 225/kg?

Triangle PQR is inscribed in the circle whose radius is 14 cm. If PQ is the diameter of the circle and PR = 10 cm, then what is the area of the triangle PQR?

If 2 pair of trouser is offered free on purchase of 3 pair of trousers priced Rs 900 each what is the effective discount on each pair of trouser?

The value of cos220°+cos270° is

If 10x/3 + 5/2(2 - x/3) = 7/2, then the value of x is?

Rajesh buys a table of Rs 900 and sells it. Rajesh gives two successive discount of 10% and 20% to the customer. What will be the selling price (in Rs) of the table?