Find the one which does not belong to that group ? 

 Choose the number that is 1/4 of half of 1/5 of 200? 

40% of a number is 190 more than 20% of 650. Find the number.

Which option does not follow the same pattern as the others?

Find the missing number in the sequence:

7, 26, 63, 124, 215, 342, _____

If one-third of one-fourth of a number is 10, then three-tenths of that number is:

The 4th and 7th term of an AP is 11 and -4 respectively. What is the 16th term?

What should come at the place of the question mark (?) in the following number series?

2556, 636, 156, ?, 6

If the price of TV sets is decreased by 30%, and the sales increase by 20%, what is the effect on the revenue received by the shopkeeper?

A balloon can hold 8 ml of gas and contains a mixture of oxygen and helium. The volume of oxygen is 16% of the total volume. A few ml of the mixture is released, and an equal amount of helium is added. After that, the same amount of the mixture as before is released and replaced by helium for the second time. As a result, the oxygen content becomes 9% of the total volume. How many ml of the mixture is released each time?