# Examples for 8th grade - page 5

- Radius

Determine the radius of the circle, if its perimeter and area is the same number. - 2nd class variations

From how many elements you can create 6480 variations of the second class? - Excavation

Mr. Radoslav calculated that excavation for a water connection dig for 10 days. His friend would take 7 days. Radoslav worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of excavation they met? - Garden

Father dig up the garden in 13 hours. Son in 18 hours. How many hours take dig up the garden together? - Number

What number is 24 % smaller than the number 51? - Powers

Is true for any number a,b,c,d equality:? ? - Present

Gift box has rectangular shape with dimensions of 3×3×5 cm. Martin wants to cover with square paper with sides of 10 cm. How much paper left him? - Gauss

Help little C.F. Gauss sum all the integers from 1 to 340. - Katy MO

Kate draw triangle ABC. Middle of AB have mark as X and the center of the side AC as Y. On the side BC wants to find the point Z such that the content area of a 4gon AXZY was greatest. What part of the triangle ABC can maximally occupy 4-gon AXZY? - River

Calculate how many promiles river Hudson average falls, if on section long 921 km flowing water from 1224 m AMSL to 154 m AMSL. - Two workers

Two workers together execute some work in 10 days. The first worker would have done himself in 20 days. How many days would have done himself a second worker? - Accidents

The count of accidents in 1993 caused 8009 women which is 7.1%. How many men caused the accidents? - Area of RT

Calculate the area of a right triangle which hypotenuse has length 20 and one hypotenuse segment has lenght 15. - Lathe

From the cube of edge 52 cm was lathed maximum cylinder. What percentage of the cube is left as waste after lathed? - Arc

Circle arc corresponding to angle is 193° is 23 dm long. What is the length of the entire circle? - Sale

If the product twice price cut by 20%, what percentage was price cut in total? - Ravens

The tale of the Seven Ravens were seven brothers, each of whom was born exactly 1.5 years after the previous one. When the eldest of the brothers was 4-times older than the youngest, mother all curse. How old was seven ravens brothers when their mother cur - Cubes

Cube, which consists of 27 small cubes with edge 3 dm has volume: - Wiring

Conduit has a cross section 22^{2}mm. Maybe put it into 6 conductors with a cross section S2 $mm^{2}? - Acreage

What acreage has a rectangular plot whose diagonal is 34 meters long and one side has a length of 16 meters. ?

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