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High school
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High school

In this section you will find teaching materials for high school. Materials from grades 1 to 3 are available. Choose the desired subject and good studies! Combinatorial Analysis Introduction Factorial of a Number Simple Arrangement Simple Permutation Simple Combination Set Theory Introduction and Symbols Symbols of Operations Concepts of Vectors Straight and Segment Oriented Direction and Direction Equipolent Segments What is a vector?

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Challenge 39

Calculator keys Difficulty level: A calculator has two keys: D, which doubles the number, and T, which erases the number of units. If a person writes 1999 and then press D, T, D, and T in sequence, which number will it be? Challenge 38 I squared a number… Challenge Index Next >> Challenge 40 Who is the big brother?
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Challenge 43

How many eggs a year ??? Difficulty level: The average monthly eggs laid by birds in Sweden are 35 eggs per month. Mr. Thomas Dhalin, a small country owner decided to upgrade his farm by buying a duck. How many eggs, according to statistics, will he have traded at the end of a year?
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Challenge 5

How much money? Difficulty level: One man spent everything in his pocket in three stores. In each one spent 1 real more than half of what it had to enter. How much did the man get upon entering the first store? Challenge 4 How many triangles? Challenge Index Next >> Challenge 6 What is the number?
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Challenge 47

Cups of sugar in cups Difficulty Level: You have 3 cups of coffee and 14 bags of sugar. How to sweeten the 3 cups using an odd number of sachets in each? Challenge 46 The diehard frog Challenge index Next >> Challenge 48 Share the apples among the children
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Challenge 51

Find out the age of children Difficulty level: Jarbas: "Mariclaudinete, how old are your 3 children ???" Mariclaudinete: "The sum of their ages is 13, their product is equal to your age." Jarbas: "Sorry, but data is missing!" Mariclaudinete: "You're right, the biggest one has red hair" Jarbas: "Ah… now I can guess!
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Challenge 53

The super-fly Difficulty level: Two trains are on the same road, 100 km apart. They start moving towards each other at a speed of 50km / h. At the same moment, a super-brand leaves the first locomotive of one of the trains and flies at 100 km / h to the locomotive of the other train. It just arrives, turns around and returns to the first locomotive, and so comes and goes from one locomotive to the other until the two trains collide and so die in the crash.
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Challenge 76

Great-grandfather's age Difficulty level: My father told me that in 1938 he was talking to his grandfather, and they observed that their age was expressed by the number formed by the last two digits of the years they were born. So when my father was born, how old was my great-grandfather? Challenge 75 Number 100 Challenge table Next >> Challenge 77 The two clocks
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Challenge 65

How many men need to leave the room? Difficulty Level: In a room with 100 people, 99% are known to be men. How many men should go out so that the percentage of men in the room becomes 98%? Challenge 64 How much is $ 10.00 times $ 10.00? Challenge Index Next >> Challenge 66 The Dog and the Hare
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Challenge 57

Cooking the Cookie Difficulty Level: How would you measure the 11 minutes it takes to cook a cookie with two 8 and 5 minute hourglass respectively? Challenge 56 Pack of Teals Challenges Index Next >> Challenge 58 Pilgrim
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Challenge 8

On the Tic Tac Toe board Difficulty Level: PUT NUMBERS 1, 2, 3, 4, 5, 6, 7, 8 AND 9 ARRANGED IN THE 9 HOUSES OF AN OLD WAY GAME TABLE THAT ADD TO THE 3 ANY STRAIGHT AND ANY DIAGONAL RESULT 15. Challenge 7 Where are you? Challenge Index Next >> Challenge 9 Ducks and Dogs
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Challenge 79

Aguiar's children Difficulty level: Aguiar's couple has several children. Each daughter has the same number of brothers and sisters, and each son has twice as many sisters as brothers. How many sons and daughters are in the family? Challenge 78 Cooking the Egg Challenge Index Next >> Challenge 80 5-Digit Palindromes
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Challenge 87

How old was Claudiomiro? Difficulty: When opening a book, an anthropologist found the following message: "My name is Claudiomiro. The year I was born was a perfect cube. The year I died, a perfect square. How much I lived was also a perfect square. " Knowing that the book was written in the eighteenth century, how old did Claudiomiro live?
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Challenge 1 Answer

The problem of ages You HAVE an age that we will call x and today IS an age that we will call y. I am twice as old as you were when I was your current age y (twice x), ie I am 2x. THEN: YOU HAVE x and now you have y. I had y and now i have 2x. So we have to: y-x = 2x-y 2y = 3x x = (2/3) * y THEN, replacing the value of x, we have: You had (2/3) * y and now you have y.
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Challenge Answer 106

Radigunda needs money Click here to view the solution submitted by the user Ladislau Saraiva Gonçalves. (PDF format - 90k) Back to statement Challenge 105 Just moving a stick Challenge index Next >> Challenge 107 Complete the letter sequence
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Challenge 11 Answer

Find the values ​​of x, y and z xy and yx are 2-digit numbers, which together add up to the 3-digit number zxz. xy + yx = zxz The largest number that can be formed by adding two 2-digit numbers is: 99 + 99 = 198 Now, if the number zxz is 3 digits, and the largest number it can be is 198, then we conclude that z = 1.
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Challenge Answer 113

Orlaneide and the animals Answer: COBRA. When the snake hits the boat, Orlaneide just has to take the boat and cross the river. * Don't take this challenge seriously, it's just to chill! Back to statement Challenge 112 The guava bug Challenge index Next >> Challenge 114 Eight queens on the chessboard
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Challenge Response 105

Moving Just a Toothpick Just move the right stick to form a square in the center: Back to statement Challenge 104 Clodovando's father and grandfather Challenge table Next >> Challenge 106 Radigunda needs money
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Challenge Response 118

Dividing the Camels The person who will divide the camels gives a camel to the 3 children. So they will have 36 camels. For the first one is given half of the camels (18 camels). He will make a profit, since his share would be 17.5 camels. For the second, it is given the third part (12 camels). He will make a profit because his share would be 11 and little.
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Challenge Response 133

The trader and the t-shirts Being x the number of t-shirts, we can assemble the following equation: 720 + (720 / x) = 65x Isolating x and solving the equation, we find x = 12. So if the merchant bought 12 t-shirts, the cost price of each of them was: 720/12 = 60 Answer: R $ 60,00. Back to statement Challenge 132 Adults and children in the elevator Challenge index Next >> Challenge 134 Nephew's mother's sister…
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Challenge Response 101

The damn tomatoes Back to statement Challenge 100 The king and the slaves Challenge table of contents Next >> Challenge 102 Serginho crossing the bridge
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