Which two Chief Ministers inaugurated the Sidheshwari

Find the missing term.

In each of the following questions, select the related number from the given alternatives:

8/15 : 2/5 : : 16/21 : ?

Select the missing number from the given responses. 

Find the missing term:

Find the missing number.

20, 30, 42, 56, 72, ?

Find the missing term in the following series:

43 44 ? 69 185

Find the missing number by analysing the pattern followed by the numbers in each row.

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

 First row: 84, 42, 49

Study the given pattern carefully and select the number that can replace the question mark [?] in it?