System of equations - practice for 14 year olds - page 17 of 61
Number of problems found: 1213
- Kilograms 39911
In a luxury praline factory, they prepared 3.2 kg of a mixture of two types of candies for CZK 273 per 1 kg. Marzipan candies cost 345 CZK/kg and nougat 255 CZK/kg. How many kilograms of each type of candy were used? - The sum
The sum of the squares of two immediately following natural numbers is 1201. Find these numbers. - The bun
The bun costs CZK 2, and the rolls CZK 3.5. Hanka bought 22 pieces of bread, bought only buns and rolls, and paid CZK 65. how many rolls did she buy, and how many rolls? - One-humped 39761
There are one-humped and two-humped camels in the caravan going through the desert. The guide counted 28 heads and 45 humps. How many humpback camels are in the caravan?
- The theater
The Manila theater charged ticket prices: adults php500, students php250, and children below 12 are php100. The theater collected a total of php100,000.00 from an audience of 250 people. What is a possible audience composition regarding the numbers of adu - Duo mix
One kilogram of meat of two colors is 650 g of pork, and the rest is chicken. One kilogram of pork is 40 CZK more expensive than a kilogram of chicken. How many CZK cost one kilogram of chicken meat so that the price of one kilogram of meat of two colors - Beginning 39061
Alena and Bára had 1,500 CZK saved together at the end of January. After Alena spent CZK 318 from her savings and Bára spent CZK 249 from her savings in February, Alena had twice as much CZK saved as Bára. How much money did they have at the beginning? - The family
How old is a mother if she is four times older than her daughter, and five years ago, she was even seven times older than her daughter? Today, a son is 30 years younger than a father. Seven years ago, a father was seven times older than a son. How old is - Alcohol solutions
We have to produce 2 liters of 60% alcohol from 55% and 80%. How many of which ones will we use in the solution?
- Admission 38691
In one HA class, there were 8 more pupils in the first group than in the second group. After the admission of two new pupils to each of the groups, there were twice as many pupils in the 1st group as in the 2nd group. How many pupils were there in each gr - Two grandmothers
Two grandmothers went to the market to sell eggs, and they had 100. When they sold all the eggs, they made the same money. The first grandmother said to the second, "If I sold my eggs for your price, I would earn 15 crowns. " The other grandmother replied - Determines 38523
We have 30 flowers, and each one has three or four petals. They have a total of 102 chips. How many flowers have four petals? Z represents the number of flowers with 4 petals. Choose the expression that determines the number of flowers with 3 petals. - Solution 38451
Prepare 2 liters (kg) of a 3% salt solution in water. - Participants
Of the 48 participants, six women are fewer than men and 24 children less than all adults. Calculate what percentage of all participants on tour are children.
- Solution 38411
Prepare 250g of a 30% solution of hydrogen peroxide in water. - Salicylic 38401
Prepare 600 g of an 8% solution of salicylic acid. - Arm and base
The isosceles triangle has a circumference of 46 cm. If the arm is 5 cm longer than the base, calculate its area. - Motorbike circuit
On a 2,550 m long circuit, two motorcycles go at such speeds that they meet every minute if they go against each other and run every 5 minutes if they go in the same direction. Find their speeds. - Coloured numbers
Mussel wrote four different natural numbers with colored markers: red, blue, green, and yellow. When the red number divides by blue, it gets the green number as an incomplete proportion, and yellow represents the remainder after this division. When it div
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