Examples of equations for practice for 12 year olds - page 31 of 59
Number of problems found: 1180
- Three-fifths 6322
Juraj donated three-fifths of his collection of hockey players to his friend Josef. He has 100 cards left. How many cards did Juraj initially have in his collection before the donation? - Twenty-six 6320
There are 32 students in the class. Twenty-six of them are learning English, 15 are learning German, and four are learning only Russian. How many students are learning English and German? - Kilograms 6297
If Adam and Boris weigh a total of 75 kg, Boris and Cyril weigh a total of 83 kilograms, and Cyril and Dano weigh a total of 92 kg, how many kilograms do Adam and Dano weigh together? - Parallelogram 6288
Find the interior angles of the parallelogram if you know that one of them is 50 degrees larger than the other.
- One-eighth 6274
How many children are in a class where one-eighth is three children? - Contribution 6273
Vojta and Martin have been contributing to charity since the same day. Vojta contributes 110 CZK every week. Martin contributes 85 CZK every week, and in addition, he made a one-off contribution of 300 CZK at the beginning. Calculate how many weeks Vojta - Simultaneously 6272
The first inflow fills the tank in 4 hours and the second tributary in 6 hours. How long will it take to fill both tributaries simultaneously, but the species will start an hour later? - Multiply 6257
If we multiply the numbers of the last three pages of the book on pyramids, we get the product 23639616. How many pages does the book have if the last page's number is steam? - Exchanged 6256
Pupils exchanged pencils, erasers, and pens so that there were two pens for 15 pencils and three pencils for two erasers. How many erasers were there for one pen?
- Three pumps
The water tank is emptied with the first pump in 6 hours and with the second pump in 2 hours. All three pumps had to be started at once to be emptied in 1 hour. How long will it take to empty the tank with only the third pump? - Konecara 6203
The trip to the top of Konecara and back lasted 5 hours and 17 minutes. We rested at the peaks for 32 minutes. The way back took 51 minutes less than the way there. How long did the trip to the top take? - Equation: 6200
Solve the equation: 2y = 4 (0.5 + 3/2) -1 - Mysterious number
The magician thinks of the number: "The mysterious number is first divided by minus five, dividing the result by three, multiplying the number by ten, and dividing the resulting number by minus four. The result is 5. Can you reveal the mysterious number? - Consecutive 6174
Find three consecutive integers whose sum is -693.
- Twenty
Twenty rabbits are put in 4 cells so that there are a different number of rabbits in each cell containing at least three rabbits. What is the largest possible number of rabbits in one cell? - Dropped sheets Three consecutive sheets dropped from the book. The sum of the numbers on the pages of the dropped sheets is 273. What number has the last page of the dropped sheets?
- Map scale
The rectangular plot has a scale of 1:10000 and an area of 3 cm² on the map. What area does this plot have on a 1:5000 scale map? - Quarters 6097
How many times are the three halves larger than eighty percent of the three quarters? - Available 6094
There are a total of 110 beds in the hotel, which are available in single, double, and triple rooms, while there are three times more triple rooms than single rooms and twice as many double rooms as triple rooms. How many triple rooms are there in total i
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