Quantitative Aptitude - Arithmetic Ability Questions

In what ratio should coffee powder costing Rs 2500/kg be mixed with coffee powder costing Rs 1500/kg so that the cost of the mixture is Rs 2250/kg?

A cloth merchant has announced 25% rebate in prices. If one needs to have a rebate of Rs. 40, then how many metres of cloth costing Rs. 32 per metre he should purchase 

The value of(1(p-n)(n-q)+1(n-q)(q-p)+1(q-p)(p-n)) is

If the measure of the interior angle of a regular polygon is 1800, then how many sides does it have?

In an army selection process, the ratio of selected to unselected was 3:1. If 80 less had applied and 40 less selected, the ratio of selected to unselected would have been 4:1. How many candidates had applied for the process?

A person lent Rs 10000 to B for 3 years and Rs 6000 to C for 4 years on simple interest at same rate of interest and received Rs 5400 in all from both of
them as interest. What is the rate of interest (in %)?

The ratio of the cost price and selling price of a bulb is 15 : 18. What is the profit percentage?

If 3x= 4y= 12, then z is equal to