Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_sr_tr_srs_r_srst_

If - means ×, × mean000000s +, + means ÷ and ÷ means -, then
4 × 4 + 16 - 16 ÷ 30 = ?

Three of the following four words are alike in a certain way and one is different. Pick the odd word out.

Arrange the following words as per order in the dictionary.
1. Arrange
2. Appeal
3. Area
4. Air
5. April

Three of the following four words are alike in a certain way and one is different. Pick the odd word out.

Which two signs should be interchanged in the following equation to make it correct?
– 12 ÷ 4 + 8 x 2 = 11

In a family of seven persons, B is the brother of A and the son of C. D is the son-in-law of C, who has two grandchildren, E and F. A is the mother of F, who is the niece of G. E is the son of G. If C has two children, how is E related D?

In a family, G is married to F and they have five children. K is uncle of G who is brother of R. How many male members are there in a family?