A bank offers 20% compound interest per half year. A customer deposits Rs 7600 each on 1^st January and 1^st July of a year. At the end of the year, the amount he would have gained from interest is –

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—

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

15     21    33    51     75    (?) 

12 men can do a work in X days. 20 women can do the same work in (X -1) days. 15 men can do the work in y days while 30 women can do it (Y- 2) days . Find the value of X. 

If , the what is the value of x?

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 ?