Examples for 8th grade - page 38
- Well
Rope with a bucket is fixed on the shaft with the wheel. The shaft has a diameter 60 cm. How many meters will drop bucket when the wheels turn 15 times? - Complementary angles
Two angles are complementary. If one angle measures 49°, what is the measure of the second angle? - Isosceles III
The base of the isosceles triangle is 24 cm area 416 cm2. Calculate the perimeter of this triangle. - Plastic pipe
Calculate weight of the plastic pipe with diameter d = 60 mm and length 400 cm if the wall thickness is 6 mm and the density of plastic is 1228 kg/m3. - Fertilizer
Mr. Gherkin use for fertilization 9% solution of fertilizer. 7 liters of it still left. How much water must be added to the solution to make only 5% solution? - Train
A passenger train traveled for 4 hours 136 km. 2.7 hours after its departure started fast train and caught it on 324 km. How many km/h is different its average speeds? - Quadrant
In what quadrant is a 1501° angle? - Right triangle
Right triangle ABC with side a = 16 and the area S = 80. Calculate the length of the remaining sides. - Salary
Calculate equivalent annual salary to hourly salary $ 29. Assume a 40-hour work week. - Heron backlaw
Calculate missing side in a triangle with sides 33 and 27 and area 118.3. - Cylinder - basics
Cylinder with base radius r = 37 cm and height h=74 cm. Calculate: - Tiles
How many tiles of 20 cm and 30 cm can build a square if we have a maximum 100 tiles? - Percentage - fractions
About what percentage we must increase number 1/6 to get number 1/3? - Three drivers
Three driversdriving the same direction found that they have same amounth of gasoline. The first is enough to go 6 km, 4 km second and third 3km. Gasoline they divided so all three just drove to the nearest petrol station. How many km away was a petrol sta - Reducing number
Reducing the an unknown number by 28.5% we get number 243.1. Determine unknown number. - Nine-gon
Calculate the perimeter of a regular nonagon (9-gon) inscribed in a circle with a radius 20 cm. - Mom and daughter
Mother is 39 years old. Her daughter is 15 years. For many years will mother be four times older than the daughter? - angles in quadrilateral
What size have angles in quadrilateral (4-gon) if they are in a ratio of 8: 9: 10: 13? - Truck
In 7 hours started from town Krnov truck at speed 40 km/h. Passenger car started against it in 8 hours 30 minutes from the city of Jihlava at speed 70 km/h. Distance between this two cities is 225 km. At what time and at what distance from Krnov this two. - Salt
1 t of sea water contains 25 kg of salt. How many tons of seawater must be evaporated to obtain 2 q of salt?
Rope with a bucket is fixed on the shaft with the wheel. The shaft has a diameter 60 cm. How many meters will drop bucket when the wheels turn 15 times?
Two angles are complementary. If one angle measures 49°, what is the measure of the second angle?
The base of the isosceles triangle is 24 cm area 416 cm2. Calculate the perimeter of this triangle.
Calculate weight of the plastic pipe with diameter d = 60 mm and length 400 cm if the wall thickness is 6 mm and the density of plastic is 1228 kg/m3.
Mr. Gherkin use for fertilization 9% solution of fertilizer. 7 liters of it still left. How much water must be added to the solution to make only 5% solution?
A passenger train traveled for 4 hours 136 km. 2.7 hours after its departure started fast train and caught it on 324 km. How many km/h is different its average speeds?
In what quadrant is a 1501° angle?
Right triangle ABC with side a = 16 and the area S = 80. Calculate the length of the remaining sides.
Calculate equivalent annual salary to hourly salary $ 29. Assume a 40-hour work week.
Calculate missing side in a triangle with sides 33 and 27 and area 118.3.
Cylinder with base radius r = 37 cm and height h=74 cm. Calculate:
How many tiles of 20 cm and 30 cm can build a square if we have a maximum 100 tiles?
About what percentage we must increase number 1/6 to get number 1/3?
Three driversdriving the same direction found that they have same amounth of gasoline. The first is enough to go 6 km, 4 km second and third 3km. Gasoline they divided so all three just drove to the nearest petrol station. How many km away was a petrol sta
Reducing the an unknown number by 28.5% we get number 243.1. Determine unknown number.
Calculate the perimeter of a regular nonagon (9-gon) inscribed in a circle with a radius 20 cm.
Mother is 39 years old. Her daughter is 15 years. For many years will mother be four times older than the daughter?
What size have angles in quadrilateral (4-gon) if they are in a ratio of 8: 9: 10: 13?
In 7 hours started from town Krnov truck at speed 40 km/h. Passenger car started against it in 8 hours 30 minutes from the city of Jihlava at speed 70 km/h. Distance between this two cities is 225 km. At what time and at what distance from Krnov this two.
1 t of sea water contains 25 kg of salt. How many tons of seawater must be evaporated to obtain 2 q of salt?- «
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