Quantitative Aptitude - Arithmetic Ability Questions

The average salary of all workers in a workshop is Rs.12000. The average salary of 7 technicians is Rs.15000 and the average salary of the rest is Rs.9000. The total number of workers in the workshop is

There are a total of 200 students in a school, of which 7/10th are boys. Find the number of girls in the school.

If x2+1x2-6, then find the value of 2x(x-1)x3-x2-x+1

For an article the profit is 170% of the cost price. If the cost price increases by 20% but the selling price remains same, then what is the new profit percentage?

In the following question, select the missing number from the given series.
 
1912, 2012, 2133, 2277, 2446, ?

∆DEF is right angled at E. If m∠F = 45°, then find the value of (cosecD - 1/√3).

A 220 metres long train takes 33 seconds to cross a 440 metres long bridge. How much time (in seconds) will the train take to cross a 350 metres long bridge?

The distance between the tops of two building 38 metres and 58 metres high is 52 metres. What will be the distance (in metres) between two buildings?