The owner of a cell phone shop charges his customer 23% more than the cost price. If a customer paid Rs. 7,011 for a cell phone, then what was the cost price of the cell phone ?

If the fractions 1/5, 2/7, 3/5, 5/6 and 11/3 are arranged in descending order of their values, which one will be the fourth ?

The total number of students in a school is 5050. If the number of girls in the school is 2450, then what is the respective ratio of the total number of boys to the total number of girls in the school ?

In an examination it is required to get 441 of the aggregate marks to pass. A student gets 392 marks and is declared failed by 5% marks. What are the maximum aggregate marks a student can get ?

What is the least number to be added to 7700 to make it a perfect square ?

Direction (Q. 6 - 10) : What should come in place of question mark (?) in the following number series ?

2 3 5 9 ? 33 65

2 5 11 23 ? 95

16 26 ? 49 62 76

81 ? 49 36 25 16

2 10 40 120 240 ?