Quantitative Aptitude - Arithmetic Ability Questions

If the standard deviation of a population is 6.5, what would be the population variance?

If Sinx = 4/5, then Sec2x - 1 = ?

How many numbers are there from 300 to 700 which are divisible by 2, 3 and 7?

A boat covers a distance of 14 km upstream and 16 km downstream in 9 hours. It covers a distance of 12 km upstream and 40 km downstream in 11hours. What is the speed (in km/hr) of the boat in still water?

After buying a toy for Rs. 66, Raghu managed to sell it at a profit of 15%. The selling price of the toy was

Neeraj's earning was decreased by 60% and after that subsequently increased by 60%. Find the final loss % on his earnings?

A factory buys 10 machines. 2 Machine­A, 3 Machine­B and rest Machine­C. Prices of the machines are Rs 95000, Rs 60000 and Rs 50000 respectively. What is the average cost of these machines?

If the areas of two similar triangle are in the ratio 5 : 7, then what is the ratio of the corresponding sides of these two triangles?