# Examples for 8th grade - page 76

- Percent

Calculate how many % is the number 26.25 less than the number 105. - Percentage - fractions

About what percentage we must increase number 1/6 to get number 1/3? - Circle - simple

Calculate the area of a circle in dm^{2,}if its circumference is 31.4 cm. - Pharmacy

The pharmacy add to 3 liters of 95-percent alcohol 5 liters of 38.04 percent alcohol. How many percent pharmacy got? - Cylinder surface area

Volume of a cylinder whose height is equal to the radius of the base is 678.5 dm^{3.}Calculate its surface area. - Common cylinder

I've quite common example of a rotary cylinder. Known: S1 = 1 m^{2,}r = 0.1 m Calculate : v =? V =? You can verify the results? - Square roots

What is equal to the product of the square roots of 295936? - Cycling trip

At 8 am started a group of children from the camp to day cycling trip. After 9:00 weather deteriorated sharply and the leader decided to send for the children bus on the same route, which started at 10 hours. For how long and at what distance from the camp - Blueberries 2

Lenka and Martin collected eight liters of blueberries in two hours. How long will take to collect blueberries by Lenka itself, if we know that she collect all 2.5 hours less than Martin? - Sales off

Calculate what was the original price of the good, if the price after discount 25% and the subsequent rise of 20% is 400 USD. - Trio 2

Decide whether trio of numbers is the side of a right triangle: 26,24,10. - 2d shape

Calculate the content of a shape in which an arbitrary point is not more than 3 cm from the segment AB. The length of the segment AB is 5 cm. - Trapezoid MO-5-Z8

Trapezoid KLMN has bases 12 and 4 cm long. The area of triangle KMN is 9 cm^{2.}What is the area of the trapezoid KLMN? - Flowerbed

Family cultivated tulips on a square flower bed of 6 meters. Later they added the square terrace with a side of 7 meters to their house. One vertex of the terrace lay exactly in the middle of a tulip bed, and one side of the terrace divided the side of the - Log

Worker cut his thick log to 6 pieces for 30 min. How long he cut log to 12 pieces? - Cuboid - ratios

The sizes of the edges of the cuboid are in the ratio 2: 3: 5. The smallest wall have area 54 cm^{2.}Calculate the surface area and volume of this cuboid. - Addends

Number 118 divide into two addends, so first addend is 69 greater than 75% of the second addend. - Combinations of sweaters

I have 4 sweaters two are white, 1 red and 1 green. How many ways can this done? - Megapascals

What is the area of crosssection of the piston, if the force of 300 kN produces a pressure of 5 MPa? - Potatoes

Daniela and Michael would jointly dug potatoes for 7.5 hours. But if Daniela was working alone she would take 2.5 hours more as if he were working with Michael. Determine how much for the work done by Michael himself and how much Daniela herself.

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