In the fruit stand of the market, they have the following offers: 1 kg of apples + 1 kg of oranges cost € 4.30 1 kg of bananas + 1 kg of oranges cost € 3.70 1 kg of apples + 1 kg of bananas cost 3, € 60 How much does a kilo of bananas cost? Solution If we define the following variables: M = 1 Kg of Apples P = 1 Kg of Bananas N = 1 Kg of Oranges We can rewrite the statement as follows: M + N = 4.30 P + N = 3.70 M + P = 3.60 And clearing we get that M = 4.30 - NN = 3.70 - PP = 3.60 - M Where can we deduce M = 4.30 - (3.70 - P) = 4.30 - (3.70 - (3.60 - M)) M = 4.30 - 3.70 + 3.60 - M 2M = 4.30 - 3.70 + 3.60 = 4.20 M = 2.10 Substituting in the third equation we obtain that P = 3.60 - 2.10 = 1.50 And finally N = 3.70 - 1.50 = 2.20.
In this advertising of the WWF association dedicated to the protection of nature and the animal world dozens of animals are hidden. Can you find them all? Solution We can find more than 20 different animals. From right to left: Elephant, baby elephant, parrot, toucan, owl, chameleon, alligator, koala, koala cub, tarantula, wild boar, monkey, orangutan, another wild boar, tiger, puma, snake, alpacas, wolf, crocodile ...
Look closely at the image on the right and discover the hidden character. What famous musician hides in the image? Solution To facilitate viewing, you can try to move away from the image or look at it from the bottom of the screen. You will see the face of the famous Beatles singer John Lennon.
Can you find the woman hiding in the drawing? Solution On the riverbed lies the woman. The fish just caught by man forms the head and left arm. Following down, the stones make up the naked body of the woman. It is easier to see if we turn the screen slightly to the left.
A crater has appeared on the floor of Paris, but where is the meteorite? Solution This drawing was made in Montparnasse, Paris, to commemorate the tenth anniversary of the explosion of the AZF factory in Toulouse in 2001. It is actually a drawing made with chalk with 3D effect. Performed by Julian Beeber.