# Examples for 8th grade - page 6

- 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. - 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. - 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? - 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? - Area of RT

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

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

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

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

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

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

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

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

Three copiers will do the same in an hour k copies. How many copies would be done in an hour by four such copiers? ? - Lorry

The lorry was loaded with 27 boxes of 24 kg. How many boxes with weight 36 kg can be loaded, if total load must be same? - Tetrahedral pyramid

What is the surface of a regular tetrahedral (four-sided) pyramid if the base edge a=23 and height v=8? - Clock

How many times a day hands on a clock overlap? - Car inflation

About what percentage price of car increased if price rose from €5000 to €5130?

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