75% of a number is equal to three-seventh of another number. What is the ratio between the first number and the second number respectively ? 

Direction (66-70): What should come in place of the question mark(?) in the following number series?

10    11    13    21    69    ?

A number which, when increased by 123% becomes 3345. The number is—

A batsman in his 20th innings make a score of 110 and there by increases his average by 4. What is his average after 20 innings? 

The ratio of the cost of table and chair is 9 : 4. The cost of the table is Rs 1250 more than the cost of the chair. What is the cost of the chair?

What approximate value should come in place of the question mark(?) in the following question.
635×455÷403=?

What will come in place of the question mark (?) in each of the following series?

15     21    33    51     75    (?)