Reason - practice for 14 year olds
Number of problems found: 780
- Two-element combinations
Write all two-element combinations from elements a, b, c, and d. - Unknown number 23
Find 2/3 of the unknown number, which is two-thirds of the 99. - Three-digit
How many do three-digit natural numbers not have the number 7? - Is right triangle
Decide if the triangle XYZ is rectangular: x = 4 m, y = 6 m, z = 4 m - Arithmetic 40671
The number 20 is the arithmetic mean of the eight numbers. Determine their sum. - Continuation 46483
Continuation of the number series 9,12,18,27 - Unknown 7837
19% of the unknown number is 12, less than 23% of the same number. Specify an unknown number. - Six on dice
When throwing two dice, what is the probability they will fall at least one six? - Probability 81678
What is the probability of guessing a PIN code (4 numbers) if it contains only even numbers? - Probability 81446
What is the probability that each digit is different in a five-digit number? - Coins
On coins found was stated that from the year 87 BC. Is it right? - Divisors
The sum of all divisors unknown odd number is 2112. Determine the sum of all divisors of a number that is twice unknown numbers. - Secret number
Find the secret number n, which reversed decreases by 16.4 if the number increases by 16.4. - Determine 82975
Determine the sum of all positive odd numbers less than 78 - Rabbits 7948
Hens and rabbits, 22 heads and 62 feet, run around the garden. How many? - Mysterious area
The trapezoid ABCD is given. Calculate its area if the area of the DBC triangle is 27 cm². - Sum and ratio
The sum and ratio of two numbers are equal to 10. Which numbers are they? - Chocolates
How many ways can we distribute eight different chocolates to four children? - Digit sum
How many are three-digit numbers that have a digit sum of 6? - Subsets
How many 19 element subsets can be made from the 26 element set?
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