System of equations - practice for 13 year olds - page 21 of 45
Number of problems found: 887
- Younger 7012
Lena is seven years older than Monica. If both Lena and Monica were four years younger, she would be twice as old as Monica. How old is Lena? - Tickets 4
Stacey is selling tickets to the school play. The tickets are $7 for adults and $5 for children. She sells twice as many adult tickets as children's and brings in a total of $342. How many of each kind of ticket did she sell? - Three brothers
The three brothers have a total of 42 years. Jan is five years younger than Peter, and Peter is two years younger than Michael. How many years has each of them? - Supplementary angles
One of the supplementary angles is larger by 33° than the second one. Calculate the angle size.
- Calculate 6885
Triangle with o = 16.8 cm and aspect ratio a:c = 1:2 and b:c = 5:6. Calculate side lengths a =? B =? c =? - Equations - simple
Solve the system of linear equations: x-2y=6 3x+2y=4 - New ratio
The ratio of ducks and chickens in our yard is 2 : 3. The total number of ducks and chickens together is 30. The mother gave 3 of the chickens to our neighbor. What is the new ratio now? - Stamps 2
Dennis spent 34.15 on stamps. The number of 0.56 is ten less than four times of stamps bought for 0.41. How many of each stamp did he buy? - Parking
At a building parking, 245 spaces are for cars, 56 are for vans, and the rest are for buses. If 14% of all parking spaces are for buses, how many parking spaces are there in the building? How many spaces are for buses?
- Supermarket 2
A supermarket had a buko pie sale. In the morning, they sold 2/3 of the pies, and in the afternoon, they sold 1/6 of the pies. If 150 pies were left, how many pies had been sold? Show your solution. - Gasoline tank 2
A gasoline tank is 1/6 full. When the family added 25 liters of gasoline, it became 3/4 full. How many are liters more needed to fill them? Show your solution. - Animals
All without two animals are dogs, all without two are parrots, all without two are cats, and the others are chickens. How many animals of individual species does Ms. Novak take care of? - Merchant 6730
A merchant sells a blend of tea. Kilogram for 450 CZK. Another species for 900 CZK. Cheaper for 369 CZK. How much tea must you buy per 5 kg of the mix? - Summer camp
Eighty-four children spent their holidays at the summer camp. There were eight fewer boys than girls. What percentage were boys and what percentage were girls?
- Circumference 6598
Adam had three identical rectangles. He put them together and got a rectangle with a circumference of 50 cm. Then, he placed them differently and got a rectangle with a larger circumference. Calculate its perimeter. - Pupils 6579
There are 169 pupils, 45 rooms, how many rooms are three beds and how many five beds? - Spending 6556
Romana, Pavol, and Ján were on vacation. Everyone paid some part of the cost. After the vacation, it was found that Romana spent Sk 19,000 for all three, Pavol Sk 7,000 for all three, and Ján Sk 4,000 for all three. How much money will each of them pay ea - Students 6541
There are a total of 47 pupils in three classes in the rural school. There are 20% more pupils in the first grade than in the second grade and one pupil less in the third grade than in the second grade. How many students are there in each class? - Bottles 6527
Five boxes of fish and three bottles of drink cost 276 CZK, three boxes of fish and two bottles of drink cost 176 CZK, and two boxes of fish and one drink bottle cost 176 CZK. Thus, we pay 276 CZK for two boxes of fish and one drink bottle.
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