Answer: C) decrease by 4% Explanation: Here, x = 20 and y = - 20Therefore, the net % change in value=x + y + xy100 %= 20 + -20 + 20 × -20100%  or  - 4% Since the sign is negative, there is a decrease in value by 4%.

Answer: C) Amazon river Explanation: There are No bridges over The Amazon River. The Amazon River, in South America, is the largest river by discharge volume of water in the world and the second longest in length after The Nile in Egypt.

Answer: A) 62.5 % Explanation: Let total population = p number of females = 5p/9number of males =(p-5p/9) = 4p/9married females = 30% of 5p/9 = 30x5p/100x9 = p/6married males = p/6unmarried males =(4p/9-p/6) = 5p/18Percentage of unmarried males in the total males = {(5p/18)/4p/9}x100 = (5p/18)x(9/4p) = 125/2 % = 62.5%

Answer: A) it contains two different elements joined by chemical bond Explanation: We know that All compounds are molecules, but not all molecules are compounds. Water is a molecule because it is made from atoms that have been chemically combined. It is also a compound because the atoms that make water are not all the same - some are oxygen and some are hydrogen.   Hence, Water is a molecule and a compound.

12 N in a C means 12 Numbers in a Clock.

19 C in a CB means 19 Coins in a Carrom Board. We have 9 white coins, 9 black coins and one red coin in a carrom board.

Answer: A) Biosphere Explanation: The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life is called Biosphere.

1001 A N means 1001 Arabian Nights.   These are same as 12 S of the Z, 64 S on a C, 19 C in CB, 8 S on SS, ...