Quantitative Aptitude - Arithmetic Ability Questions

One of the two inlet pipes works twice as efficiently as the other. The two, working alongside a drain pipe that can empty a cistern all by itself in 8 hours, can fill the empty cistern in 8 hours. How many hours will the less efficient inlet pipe take to fill the empty cistern by itself?

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

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

A sum of Rs. 69 was divided between Jason and Ruhana in the ratio 1:2. How much money did Ruhana get?

What should be the missing digit so that the number 275_476 becomes exactly divisible by 11?

The length of one side of a rhombus is 13 cm and one of the diagonals is 10 cm. What is the legth of the other diagonal?

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

If a retailer offers a discount of 28% on the marked price of his goods and thus ends up selling at cost price, what was the % mark up?