Quantitative Aptitude - Arithmetic Ability Questions

A man buys 10 oranges for Rs. 3 and sells 8 for Rs. 3. Calculate his gain percent.

Two pipes, when working one at a time can fill a cistern in 2 hrs and 3 hrs, respectively while a third pipe can drain the cistern empty in 6 hrs. All the three pipes were opened together when the cistern was 1/6 full. How long will it take for the cistern to be completely full?

Select the odd word/letters/number/number pair from the given alternatives.

What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

Find the unit place digit in 192102 + 193103

4 + 16 x -12 x 24 - 13 - 3 ÷ 20 - 4 = ?

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

Find the HCF of 48, 92 and 140